[VOL-5329] - Update copyright docs to mention SPDX

overview/contributing/copyright.rst
overview/contributing/copyright/Makefile.rst
overview/contributing/copyright/copyright.rst
overview/contributing/copyright/golang.rst
overview/contributing/copyright/json.rst
overview/contributing/copyright/markdown.rst
---------------------------------------------
  o Add examples of copyright notice in source.
  o json syntax most difficult to add.
  o Document SPDX tokens.
  o Creat a containing folder copyright/ so documentation setup can be modular.

conf.py
release_notes/voltha_2.12.rst
-----------------------------
  o Sphinx replace:: feature stopped working, linkcheck reports broken urls.
  o Move mvn-* and jira string templates into conf.py as ext links.
  o Replace |token| with :token:.
  o Also shorten several verbatim URLs with :vol-{ger,git}: extlinks.

Change-Id: I0f9ec3f4354044968805da1872fc9f6bd864996f
Signed-off-by: Joey Armstrong <jarmstrong@linuxfoundation.org>
diff --git a/overview/contributing/copyright/copyright.rst b/overview/contributing/copyright/copyright.rst
new file mode 100644
index 0000000..13743b1
--- /dev/null
+++ b/overview/contributing/copyright/copyright.rst
@@ -0,0 +1,42 @@
+Copyright Notice
+================
+
+Include a copyright notice with all submissions to ONF repositoreis.
+
+- ``Copyright 2017-2023 Open Networking Foundation Contributors``
+- NOTE: Range values such as -present are not legally binding
+
+  - Copyright notice should be dated to the last year sources were modified.
+
+- Add SPDX tokens for programatic validation.
+
+.. toctree::
+   :maxdepth: 1
+   :hidden:
+   :caption: Copyright notice syntax
+
+   golang syntax <golang>
+   JSON <json>
+   Makefile <Makefile>
+   Markdown <markdown>
+
+License Validation: linting
+---------------------------
+
+- `REUSE Software <https://reuse.software/>`_
+- `The REUSE tool <https://git.fsfe.org/reuse/tool>`_
+- `pre-commit <https://pre-commit.com/>`_ hook `reuse-tool <https://github.com/fsfe/reuse-tool>`_
+
+See Also
+--------
+
+- `Copyright notices <https://github.com/joey-onf/copyright>`_
+- `Message syntax <https://github.com/joey-onf/copyright/blob/origin/master/notice>`_
+- `ONF CLA Information <https://wiki.opencord.org>`_
+- `Contributing License Agreement Manager <https://cla.opennetworking.org/>`_
+
+SPDX
+^^^^
+
+- `Handling license info <https://spdx.dev/learn/handling-license-info/>`_
+- `SPDX License List <https://spdx.org/licenses/>`_