conf.py
----
   * Import extension sphinx.ext.extlinks for rewriting/shortening URLs.
   * Define extlinks vol-{git,ger,jira} for documenting.

howto/edit_voltha_docs.rst
----
   * Build out docs for make lint and make html.
   * Include iamge files from an earlier howto patch to help get content in.

howto/voltha_repositories.rst
----
   * Pull in docs from another howto patch.
   * Describe gerrit and git repos.

Bump the copyright revision string to 2022.

Change-Id: Iacc139d764682d586c2cd88150c8e1795e479662
diff --git a/howto/edit_voltha_docs.rst b/howto/edit_voltha_docs.rst
index 463e86c..b63c44f 100644
--- a/howto/edit_voltha_docs.rst
+++ b/howto/edit_voltha_docs.rst
@@ -1,19 +1,22 @@
 Modify docs.voltha.org
 ======================
 
-Docs for VOLTHA can be found on the website or via web search:
-
+Docs for VOLTHA can be found on the website or via web search
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
 - https://docs.voltha.org
 - https://docs.voltha.org/master/index.html
 
    - Note: Google search may return an older doc version for topics.
    - Navigate to /master/index.html and use the builtin searchbox to always view current documentation for VOLTHA.
 
-Browse repository content:
+Browse repository content
+"""""""""""""""""""""""""
+- :vol-ger:`voltha-docs`
+- :vol-git:`voltha-docs`
 
-- https://gerrit.opencord.org/plugins/gitiles/voltha-docs
 
-Checkout, modify and test:
+Checkout, modify and test
+"""""""""""""""""""""""""
 
 .. sourcecode:: shell
 
@@ -22,6 +25,38 @@
    $ cd voltha-docs
    $ vi *.rst
    $ make html           # doc generation
+   $ make lint           # syntax checking
    $ make test           # syntax check *.rst files
 
    $ "$BROWSER" _build/html/index.html  # BROWSER='firefox'
+
+
+make lint (syntax checking)
+"""""""""""""""""""""""""""
+- `make help (pending) <https://gerrit.opencord.org/c/voltha-system-tests/+/33306>`
+
+.. sourcecode:: shell
+
+   $ make help
+   $ USAGE: make target [, target(s)]
+   $
+   $ [LINT]
+   $  lint-json            Syntax check json sources
+   $  lint-python          Syntax check using pylint and flake8
+   $  lint-robot           Syntax check robot sources using rflint
+   $  lint-yaml            Syntax check yaml source using yamllint
+   $
+   $ make lint
+
+
+make html
+"""""""""
+- Install python packages: sphinx, pylint, flake8
+- Invoke sphinx to generate documentation.
+
+
+See Also
+""""""""
+- `RST Markup Documentation <https://rstdoc.readthedocs.io/en/latest>`
+- `Sphinx Documentation <https://www.sphinx-doc.org/en/master>`
+- `RST Markup Specification <https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html>`