DOC: Convert titles to sentence case (#23643)

Partially addresses #16261.

14 files changed, 29 insertions, 29 deletions

diff --git a/doc/source/dev/alignment.rst b/doc/source/dev/alignment.rst
index bb1198ebf..f2321d17b 100644
--- a/doc/source/dev/alignment.rst
+++ b/doc/source/dev/alignment.rst
@@ -3,7 +3,7 @@
 .. _alignment:
 
 ****************
-Memory Alignment
+Memory alignment
 ****************
 
 NumPy alignment goals
diff --git a/doc/source/dev/gitwash/git_resources.rst b/doc/source/dev/gitwash/git_resources.rst
index c41af762c..b6930f394 100644
--- a/doc/source/dev/gitwash/git_resources.rst
+++ b/doc/source/dev/gitwash/git_resources.rst
@@ -1,7 +1,7 @@
 .. _git-resources:
 
 =========================
-Additional Git_ Resources
+Additional Git_ resources
 =========================
 
 Tutorials and summaries
diff --git a/doc/source/dev/reviewer_guidelines.rst b/doc/source/dev/reviewer_guidelines.rst
index 8d938319e..f3bc1600b 100644
--- a/doc/source/dev/reviewer_guidelines.rst
+++ b/doc/source/dev/reviewer_guidelines.rst
@@ -1,7 +1,7 @@
 .. _reviewer-guidelines:
 
 ===================
-Reviewer Guidelines
+Reviewer guidelines
 ===================
 
 Reviewing open pull requests (PRs) helps move the project forward. We encourage
diff --git a/doc/source/f2py/buildtools/cmake.rst b/doc/source/f2py/buildtools/cmake.rst
index 8c654c73e..db64453b4 100644
--- a/doc/source/f2py/buildtools/cmake.rst
+++ b/doc/source/f2py/buildtools/cmake.rst
@@ -18,7 +18,7 @@ but this `extensive CMake collection`_ of resources is great.
    ``f2py`` is not particularly native or pleasant; and a more natural approach
    is to consider :ref:`f2py-skbuild`
 
-Fibonacci Walkthrough (F77)
+Fibonacci walkthrough (F77)
 ===========================
 
 Returning to the ``fib``  example from :ref:`f2py-getting-started` section.
diff --git a/doc/source/reference/arrays.nditer.rst b/doc/source/reference/arrays.nditer.rst
index 8cabc1a06..fb1c91a07 100644
--- a/doc/source/reference/arrays.nditer.rst
+++ b/doc/source/reference/arrays.nditer.rst
@@ -3,7 +3,7 @@
 .. _arrays.nditer:
 
 *********************
-Iterating Over Arrays
+Iterating over arrays
 *********************
 
 .. note::
@@ -23,7 +23,7 @@ can accelerate the inner loop in Cython. Since the Python exposure of
 iterator API, these ideas will also provide help working with array
 iteration from C or C++.
 
-Single Array Iteration
+Single array iteration
 ======================
 
 The most basic task that can be done with the :class:`nditer` is to
@@ -64,7 +64,7 @@ namely the order they are stored in memory, whereas the elements of
 `a.T.copy(order='C')` get visited in a different order because they
 have been put into a different memory layout.
 
-Controlling Iteration Order
+Controlling iteration order
 ---------------------------
 
 There are times when it is important to visit the elements of an array
@@ -88,7 +88,7 @@ order='C' for C order and order='F' for Fortran order.
 
 .. _nditer-context-manager:
 
-Modifying Array Values
+Modifying array values
 ----------------------
 
 By default, the :class:`nditer` treats the input operand as a read-only
@@ -128,7 +128,7 @@ note that prior to 1.15, :class:`nditer` was not a context manager and
 did not have a `close` method. Instead it relied on the destructor to
 initiate the writeback of the buffer.
 
-Using an External Loop
+Using an external loop
 ----------------------
 
 In all the examples so far, the elements of `a` are provided by the
@@ -161,7 +161,7 @@ elements each.
     ...
     [0 3] [1 4] [2 5]
 
-Tracking an Index or Multi-Index
+Tracking an index or multi-index
 --------------------------------
 
 During iteration, you may want to use the index of the current
@@ -210,7 +210,7 @@ raise an exception.
       File "<stdin>", line 1, in <module>
     ValueError: Iterator flag EXTERNAL_LOOP cannot be used if an index or multi-index is being tracked
 
-Alternative Looping and Element Access
+Alternative looping and element access
 --------------------------------------
 
 To make its properties more readily accessible during iteration,
@@ -246,7 +246,7 @@ produce identical results to the ones in the previous section.
     array([[ 0,  1,  2],
            [-1,  0,  1]])
 
-Buffering the Array Elements
+Buffering the array elements
 ----------------------------
 
 When forcing an iteration order, we observed that the external loop
@@ -274,7 +274,7 @@ is enabled.
     ...
     [0 3 1 4 2 5]
 
-Iterating as a Specific Data Type
+Iterating as a specific data type
 ---------------------------------
 
 There are times when it is necessary to treat an array as a different
@@ -382,7 +382,7 @@ would violate the casting rule.
       File "<stdin>", line 2, in <module>
     TypeError: Iterator requested dtype could not be cast from dtype('float64') to dtype('int64'), the operand 0 dtype, according to the rule 'same_kind'
 
-Broadcasting Array Iteration
+Broadcasting array iteration
 ============================
 
 NumPy has a set of rules for dealing with arrays that have differing
@@ -417,7 +417,7 @@ which includes the input shapes to help diagnose the problem.
     ...
     ValueError: operands could not be broadcast together with shapes (2,) (2,3)
 
-Iterator-Allocated Output Arrays
+Iterator-allocated output arrays
 --------------------------------
 
 A common case in NumPy functions is to have outputs allocated based
diff --git a/doc/source/reference/distutils_guide.rst b/doc/source/reference/distutils_guide.rst
index a72a9c4d6..6f927c231 100644
--- a/doc/source/reference/distutils_guide.rst
+++ b/doc/source/reference/distutils_guide.rst
@@ -1,6 +1,6 @@
 .. _distutils-user-guide:
 
-NumPy Distutils - Users Guide
+NumPy distutils - users guide
 =============================
 
 .. warning::
diff --git a/doc/source/reference/global_state.rst b/doc/source/reference/global_state.rst
index d73da4244..a898450af 100644
--- a/doc/source/reference/global_state.rst
+++ b/doc/source/reference/global_state.rst
@@ -1,7 +1,7 @@
 .. _global_state:
 
 ************
-Global State
+Global state
 ************
 
 NumPy has a few import-time, compile-time, or runtime options
@@ -11,10 +11,10 @@ purposes and will not be interesting to the vast majority
 of users.
 
 
-Performance-Related Options
+Performance-related options
 ===========================
 
-Number of Threads used for Linear Algebra
+Number of threads used for Linear Algebra
 -----------------------------------------
 
 NumPy itself is normally intentionally limited to a single thread
@@ -56,10 +56,10 @@ Setting ``NPY_DISABLE_CPU_FEATURES`` will exclude simd features at runtime.
 See :ref:`runtime-simd-dispatch`.
 
 
-Debugging-Related Options
+Debugging-related options
 =========================
 
-Relaxed Strides Checking
+Relaxed strides checking
 ------------------------
 
 The *compile-time* environment variable::
diff --git a/doc/source/reference/index.rst b/doc/source/reference/index.rst
index 8e4a81436..4756af5fa 100644
--- a/doc/source/reference/index.rst
+++ b/doc/source/reference/index.rst
@@ -3,7 +3,7 @@
 .. _reference:
 
 ###############
-NumPy Reference
+NumPy reference
 ###############
 
 :Release: |version|
diff --git a/doc/source/reference/internals.code-explanations.rst b/doc/source/reference/internals.code-explanations.rst
index d34314610..db3b3b452 100644
--- a/doc/source/reference/internals.code-explanations.rst
+++ b/doc/source/reference/internals.code-explanations.rst
@@ -1,7 +1,7 @@
 :orphan:
 
 *************************
-NumPy C Code Explanations
+NumPy C code explanations
 *************************
 
 .. This document has been moved to ../dev/internals.code-explanations.rst.
diff --git a/doc/source/reference/routines.ctypeslib.rst b/doc/source/reference/routines.ctypeslib.rst
index c6127ca64..fe5ffb5a8 100644
--- a/doc/source/reference/routines.ctypeslib.rst
+++ b/doc/source/reference/routines.ctypeslib.rst
@@ -1,7 +1,7 @@
 .. module:: numpy.ctypeslib
 
 ***********************************************************
-C-Types Foreign Function Interface (:mod:`numpy.ctypeslib`)
+C-Types foreign function interface (:mod:`numpy.ctypeslib`)
 ***********************************************************
 
 .. currentmodule:: numpy.ctypeslib
diff --git a/doc/source/reference/routines.datetime.rst b/doc/source/reference/routines.datetime.rst
index 966ed5a47..72513882b 100644
--- a/doc/source/reference/routines.datetime.rst
+++ b/doc/source/reference/routines.datetime.rst
@@ -1,6 +1,6 @@
 .. _routines.datetime:
 
-Datetime Support Functions
+Datetime support functions
 **************************
 
 .. currentmodule:: numpy
@@ -12,7 +12,7 @@ Datetime Support Functions
    datetime_data
 
 
-Business Day Functions
+Business day functions
 ======================
 
 .. currentmodule:: numpy
diff --git a/doc/source/reference/routines.io.rst b/doc/source/reference/routines.io.rst
index 2542b336f..1ec2ccb5e 100644
--- a/doc/source/reference/routines.io.rst
+++ b/doc/source/reference/routines.io.rst
@@ -83,7 +83,7 @@ Data sources
 
    DataSource
 
-Binary Format Description
+Binary format description
 -------------------------
 .. autosummary::
    :toctree: generated/
diff --git a/doc/source/user/howtos_index.rst b/doc/source/user/howtos_index.rst
index 4a0a22900..ca30f7e91 100644
--- a/doc/source/user/howtos_index.rst
+++ b/doc/source/user/howtos_index.rst
@@ -1,7 +1,7 @@
 .. _howtos:
 
 ################
-NumPy How Tos
+NumPy how-tos
 ################
 
 These documents are intended as recipes to common tasks using NumPy. For
diff --git a/doc/source/user/theory.broadcasting.rst b/doc/source/user/theory.broadcasting.rst
index a4973e4e6..f277d4afd 100644
--- a/doc/source/user/theory.broadcasting.rst
+++ b/doc/source/user/theory.broadcasting.rst
@@ -1,7 +1,7 @@
 :orphan:
 
 ===========================
-Array Broadcasting in Numpy
+Array broadcasting in Numpy
 ===========================
 
 ..