For single line Git commit messages, the close quote should be on the same line as the open quote

Originally opened at !7299 (closed) by @jzinn.

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What does this MR do?

Chomps merge commit messages so that there is not a dangling close quote.

A better solution would be not to use quotes at all, but to set off the message in a <div> with a background color.

Screenshots (if relevant)