[VOL-5252] Update release matrix for repo:voltha-openonu-adapter-go

release_notes/voltha_2.12.rst
-----------------------------
  o Update release matrix with onu-adapter-go artifact and chart version.

howto/release/tasks/charts.rst
------------------------------
  o Create an anchored document for chart editing.
  o This common document can then be referenced by per-repo chart edit docs.

howto/release/charts/notes.rst
howto/release/charts/voltha-openolt-adapter.rst
howto/release/charts/voltha-openonu-adapter.rst
-----------------------------------------------
  o Document edits for openonu.
  o Re-arrange some of the content.

howto/code/index.rst
howto/code/lint/
howto/code/linting.rst
----------------------
  o Move help topics lint-chart and lint-helm into an individual rst file.
  o This helps support creation of an anchor for document linking.

Change-Id: I03bf4742a3ce8075c93827004466f9c1d7408859
diff --git a/howto/release/tasks/charts.rst b/howto/release/tasks/charts.rst
new file mode 100644
index 0000000..c6b70aa
--- /dev/null
+++ b/howto/release/tasks/charts.rst
@@ -0,0 +1,21 @@
+.. _Release Task Helm Charts:
+
+Helm Chart Update
+=================
+
+.. code-block:: shell-session
+   :caption: Update helm charts for deployed VOLTHA and ONOS artifacts
+
+   # clone repo:voltha-helm-charts
+   % git clone "ssh://gerrit.opencord.org:29418/voltha-helm-charts.git"
+   % cd voltha-helm-charts
+
+   # Gather files to edit
+   % vi $(grep -r 'adapter' . | cut -d: -f1 | sort -u)
+
+   # Gather indirect dependencies to edit
+   vi voltha/Chart.yaml voltha-infra/Chart.yaml voltha-stack/Chart.yaml
+
+   # Sanity check edits
+   % make lint-chart
+   % make lint-helm