Update voltha components in release matrix grid

Change-Id: I9cc271fb8b3610eb8ef2039408a0276fee73b602
diff --git a/howto/release/repositories/voltha-docs/release.rst b/howto/release/repositories/voltha-docs/release.rst
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+.. _Release Repository voltha-docs:
+
+Repository: voltha-docs
+=========================
+
+- `repo:ci-voltha-docs <https://gerrit.opencord.org/plugins/gitiles/votlha-docs>`_
+- Last repository to be released.
+- Repository is branched then a tag is created attached t4o branch.
+
+## Command usage: bttb.sh
+
+See Also
+--------
+https://docs.voltha.org/master/release_notes/release_process.html