doc: Add an overview of the 'dpdk' port

These ports are used to allow ingress/egress from the host and are
therefore _reasonably_ important. However, there is no clear overview of
what these ports actually are or why things are done the way they are.
Start closing this gap by providing a standalone example of using these
ports along with a little more detailed overview of the binding process.

There is additional cleanup to be done for the DPDK howto, but that will
be done separately.

We enable the TODO directive so we can actually start calling out some
TODOs.

Signed-off-by: Stephen Finucane <stephen@that.guru>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/Documentation/conf.py b/Documentation/conf.py
index 6ab144c5d..babda21de 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -32,7 +32,7 @@ needs_sphinx = '1.1'
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = []
+extensions = ['sphinx.ext.todo']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']