Misc updates related to release.

howto/release/components/index.rst
howto/release/components/maclearner/index.rst
howto/release/components/olttopology/index.rst
howto/release/components/pppoeagent/index.rst
----------------------------------------------
  o Document maven plugins and dependencies for components.

config.mk
---------
  o Disable yaml linting for now, volume problems to cleanup.

howto/code/index.rst
howto/code/job-failures.rst
---------------------------
  o Added a new page for documenting common jenkins problems.

howto/release/checklist.rst
howto/release/preparation.rst
overview/contributing.rst
release_notes/release_process.rst
---------------------------------
  o Incremental edits related to release steps.

Change-Id: I84db4d422556dbbeeaa5bf5351060dc193585e40
diff --git a/howto/release/checklist.rst b/howto/release/checklist.rst
index 66cd045..789d779 100644
--- a/howto/release/checklist.rst
+++ b/howto/release/checklist.rst
@@ -113,3 +113,5 @@
      - Run gofmt on sources
    * - make mod-update
      - Update go mod files
+
+Review `voltha-helm-charts <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts>`_