Merge branch 'js/contributor-docs-updates'

Doc update. * js/contributor-docs-updates: SubmittingPatches: hyphenate non-ASCII SubmittingPatches: clarify GitHub artifact format SubmittingPatches: clarify GitHub visual SubmittingPatches: provide tag naming advice SubmittingPatches: update extra tags list SubmittingPatches: discourage new trailers SubmittingPatches: drop ref to "What's in git.git" CodingGuidelines: write punctuation marks CodingGuidelines: move period inside parentheses