Howto release doc additions

code/release-bugfix.rst
-----------------------
  o Howto create a release branch patch

howto/release/overview.rst
--------------------------
  o Early writeup of release actions.
  o Edits needed for both branch=release and branch=master

Change-Id: I34ecc54217b2f185f7737f3244fceb2a4ddf4c5d
diff --git a/howto/release/index.rst b/howto/release/index.rst
index 6fa5f55..a276db6 100644
--- a/howto/release/index.rst
+++ b/howto/release/index.rst
@@ -4,6 +4,7 @@
 .. toctree::
    :maxdepth: 1
 
+   overview
    preparation
    release-notes