Just applying changes to commit messages as suggested by Ævar Arnfjörð
Bjarmason:

nit @ subject: I'd suggest:

Documentation/config/pgp.txt: replace stray <TAB> character with <SPC>

Or something, i.e. the "docs" can just be replaced by the filename, so
we don't need to put it at the end.

As general style, we tend to not have the <msg> part of "<subsystem>:
<msg>" start with a capital letter, i.e. "fix" not "Fix".