check-docs: mention gitweb specially
check-docs: mention gitweb specially

Like gitk, gitweb is not listed in the usual Makefile
variables and must be fed to check-docs specially. Otherwise
check-docs thinks it is documented but removed.

Signed-off-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git