[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/code/lint/lint-helm.rst b/howto/code/lint/lint-helm.rst
new file mode 100644
index 0000000..18994fc
--- /dev/null
+++ b/howto/code/lint/lint-helm.rst
@@ -0,0 +1,23 @@
+.. _Makefile Target lint-helm:
+
+LINT: lint-helm
+===============
+
+Helm Charts
+===========
+
+Command(s):
+- `helmlint.sh <https://gerrit.opencord.org/plugins/gitiles/helm-repo-tools/+/refs/heads/master/helmlint.sh>`_
+
+.. code:: bash
+
+    make clean
+    make lint-helm 2>&1 | tee log
+
+Sources:
+
+- `makefiles/lint <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/makefiles/lint/>`__
+- `makefiles/lint/helm/include.mk <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/makefiles/lint/helm/include.mk>`_
+- [`master <https://gerrit.opencord.org/plugins/gitiles/helm-repo-tools/+/refs/heads/master>`__] `helm-repo-tools <https://gerrit.opencord.org/plugins/gitiles/helm-repo-tools>`_
+
+|