doc: use "repository" in maintaining-V8 doc
Use "repository" instead of "repo". This also adjusts capitalization in a header that was already being modified to use "repository" because even I couldn't bring myself to put that in a separate commit.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Use "repository" instead of "repo". This also adjusts capitalization in a header that was already being modified to use "repository" because even I couldn't bring myself to put that in a separate commit.