commit: --cleanup is a message option

In the usage message for "git commit", the --cleanup option appeared
at the end, as one of the "contents options":

usage: git commit [options] [--] <filepattern>...
...
Commit message options
...
Commit contents options
...
    --allow-empty         ok to record an empty change
    --cleanup <default>   how to strip spaces and #comments from message

This is confusing, in part because it makes it ambiguous whether
--allow-empty, just above, refers to an empty diff or an empty message.

Move --cleanup into the 'message options' group.  Also add a pair of
comments to prevent similar oversights in the future.

Signed-off-by: Greg Price <price@ksplice.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-commit.c

diff --git a/builtin-commit.c b/builtin-commit.c
index fde7b89..cd4eff4 100644
--- a/builtin-commit.c
+++ b/builtin-commit.c
@@ -86,8 +86,8 @@
 static struct option builtin_commit_options[] = {
 	OPT__QUIET(&quiet),
 	OPT__VERBOSE(&verbose),
-	OPT_GROUP("Commit message options"),
 
+	OPT_GROUP("Commit message options"),
 	OPT_STRING('F', "file", &logfile, "FILE", "read log from file"),
 	OPT_STRING(0, "author", &force_author, "AUTHOR", "override author for commit"),
 	OPT_CALLBACK('m', "message", &message, "MESSAGE", "specify commit message", opt_parse_m),
@@ -96,6 +96,8 @@
 	OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
 	OPT_STRING('t', "template", &template_file, "FILE", "use specified template file"),
 	OPT_BOOLEAN('e', "edit", &edit_flag, "force edit of commit"),
+	OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
+	/* end commit message options */
 
 	OPT_GROUP("Commit contents options"),
 	OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
@@ -106,7 +108,7 @@
 	OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
 	{ OPTION_STRING, 'u', "untracked-files", &untracked_files_arg, "mode", "show untracked files, optional modes: all, normal, no. (Default: all)", PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
 	OPT_BOOLEAN(0, "allow-empty", &allow_empty, "ok to record an empty change"),
-	OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
+	/* end commit contents options */
 
 	OPT_END()
 };