Learn English – specific name for the line commonly drawn under arithmetic problems

For a single generic phrasing, I'd suggest "correct text".

For more specific commit messages, "fix grammar", "fix spelling", "re-word message", or "rewrite text" could all be used.

The answer is "query".

Oxford English Dictionary, s.v. query, n 2:

A question mark (?), used in writing to indicate a degree of doubt about the accuracy or validity of a following (occas., a preceding) word or statement. Also used in speech to express a written question mark of this kind. Cf. qy. int.