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/resources.rst b/howto/release/repositories/voltha-onos/resources.rst
index 0e0ca93..d651e83 100644
--- a/howto/release/repositories/voltha-onos/resources.rst
+++ b/howto/release/repositories/voltha-onos/resources.rst
@@ -4,5 +4,6 @@
 https://repo.maven.apache.org/maven2/org/onosproject/onos/
 
 - repo:voltha-onos
+
   - consumed by Dockerfile.voltha-onos
   - version too low, dockefile loads much higher