Option -i|--info for "git-help" is documented only in the new
"git-help.txt" man page, but this new man page is referenced
from the "--help" option documentation in the "git.txt" man page.
Signed-off-by: NChristian Couder <chriscool@tuxfamily.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>