docs: custom role for Bugzilla links

Change-Id: Ie8fefd5eee9484308231d724f9681f45fe9b7dc4
docs: back-filled release notes for 0.11

Also moved the current development release notes from release-0.12 to
next. That way a patch does not need to be adjusted in advance according
to what release it will be in.

Change-Id: I65de6f6dd0ed93ab944d549c7ae7e2adf14f9f04