doc: config: mention core.commentChar on commit.cleanup
Mention it in parentheses since we are in a configuration context.
Refer to the default as such, not as “the” character.
Also don’t mention `#` again; just say “comment character”.
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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