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/index.rst b/howto/release/index.rst
index da347a5..db164b3 100644
--- a/howto/release/index.rst
+++ b/howto/release/index.rst
@@ -4,6 +4,7 @@
    :maxdepth: 2
 
    components/index
+   hierarchy/index
 
    voltctl/index
    voltctl/install