add networking write up for devstack
This explains the current state of networking in devstack, and a
couple of scenarios that people might want to try out for local
testing.
Change-Id: I2be35f4345bf9306c981ef6f0186b48da7d06772
diff --git a/doc/source/index.rst b/doc/source/index.rst
index d89637e..435011b 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -120,7 +120,8 @@
-------------
Learn more about our :doc:`configuration system <configuration>` to
-customize devstack for your needs.
+customize devstack for your needs. Including making adjustments to the
+default :doc:`networking <networking>`.
Read :doc:`guides <guides>` for specific setups people have (note:
guides are point in time contributions, and may not always be kept