Autogen: Add (CMAKE_)AUTOGEN_ORIGIN_DEPENDS documentation

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diff --git a/Help/prop_tgt/AUTOGEN_ORIGIN_DEPENDS.rst b/Help/prop_tgt/AUTOGEN_ORIGIN_DEPENDS.rst
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+++ b/Help/prop_tgt/AUTOGEN_ORIGIN_DEPENDS.rst
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+AUTOGEN_ORIGIN_DEPENDS
+----------------------
+
+Switch for forwarding origin target dependencies to the corresponding
+``_autogen`` target.
+
+Targets which have their :prop_tgt:`AUTOMOC` or :prop_tgt:`AUTOUIC` property
+``ON`` have a corresponding ``_autogen`` target which is used to auto generate
+``moc`` and ``uic`` files.  As this ``_autogen`` target is created at
+generate-time, it is not possible to define dependencies of it,
+such as to create inputs for the ``moc`` or ``uic`` executable.
+
+The dependencies of the ``_autogen`` target are composed from
+
+- the origin target dependencies
+  (by default enabled via :prop_tgt:`AUTOGEN_ORIGIN_DEPENDS`)
+- user defined dependencies from :prop_tgt:`AUTOGEN_TARGET_DEPENDS`
+
+:prop_tgt:`AUTOGEN_ORIGIN_DEPENDS` decides whether the origin target
+dependencies should be forwarded to the ``_autogen`` target or not.
+
+By default :prop_tgt:`AUTOGEN_ORIGIN_DEPENDS` is initialized from
+:variable:`CMAKE_AUTOGEN_ORIGIN_DEPENDS` which is ``ON`` by default.
+
+See the :manual:`cmake-qt(7)` manual for more information on using CMake
+with Qt.