VOL-4840 - Tracking ticket for release documentation.

conf.py
-------
  o Define more external link macros to shorten URLs.

Misc
----
  o Updated comments on version strings and misc items.

Change-Id: Ib4bc650e575bdc4b5c6a666c4147c8b93a41e797
diff --git a/howto/release/components/index.rst b/howto/release/components/index.rst
index f13b276..b859afe 100644
--- a/howto/release/components/index.rst
+++ b/howto/release/components/index.rst
@@ -64,6 +64,7 @@
 .. toctree::
 
    onos_dependencies
+   voltha-protos
 
    voltctl/index
    voltctl/install