Update docs.voltha.org release version matrix.

howot/release/repositories/
  o Document more caveats for releasing indivdiual repositories.
  o repo:ci-management must be released twice:
    - first to establish a branhc for pipeline jobs.
    - second to update dependent versions after downstream repos have been released

Change-Id: I33d7f2442a1d4ea45a48caef0e49df92988cc2ce
diff --git a/howto/release/repositories/voltha-onos/dependencies.rst b/howto/release/repositories/voltha-onos/dependencies.rst
index b6365c3..f925856 100644
--- a/howto/release/repositories/voltha-onos/dependencies.rst
+++ b/howto/release/repositories/voltha-onos/dependencies.rst
@@ -1,3 +1,3 @@
 Dependencies: voltha-onos
-================================
+=========================