Enhance Submitting Code section

overview/contributing.rst
overview/contributing/code_review.rst
overview/contributing/copyright.rst
overview/contributing/jira_tickets.rst
howto/code/commit-message.rst
howto/code/pull_request.rst
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  - Document a few items that surfaced in code reviews this morning.
  - Add more links to existing documentation.

howto/release/repositories/pod-configs/
howto/release/repositories/voltha-onos/release.rst
howto/release/repositories/voltha-onos/todo.rst
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  - Create skeleton directories for documenting release items needed.
  - Submitted as part of an earlier patch but included here for good measure.

Change-Id: Ibe118570bdf19ced1d06d6e9efb10fd1419f82ef
14 files changed