publishing docs
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Added branch policy documentation
Merge remote-tracking branch 'upstream/support/3.0.x' into contributing-docs

Conflicts:
	docs/contributing/index.rst
Update release notes for 3.0.6
Fix typo
Merge pull request #3569 from evildmp/update_release_notes

Update release notes
Merge pull request #3568 from evildmp/publishing

Amendments to publishing documentation
Merge pull request #3553 from evildmp/contributing-docs

Added branch policy documentation