git commit notation

[Eric Abrahamsen]

Is there some special git commit notation for commits that only change
comments or docstrings? I ask because I've seen some commit notices that
start with the ";" comment character, and I can't tell if those are
merge commits, or "no code change" commits.

I'm wondering if there are some such commits that don't trigger
testing/new builds, or something like that.

Thanks,
Eric