@inthehands This question confuses me. The content is crucial, but these messages are likely not a problem, depending on context. The main thing I want in a commit message is a link back to the issue/bug report/forums discussion/whatever that led to a change, if there is one.
If there isn't one, and this is just an editorial change, then "edited bar.txt" is fine (superfluous, because the change itself has that information, but fine). If there's a substantive change and no discussion to link to, I'd like to have rationale in the message. But if the rationale is already somewhere else, all I need is a link to it (and when you paraphrase it in your commit message, you'll probably get some details wrong, so I'd rather have the link).