doc: the mode param of -u of git commit is optional

Fix the synopsis to reflect the option description.

Signed-off-by: Jean-Noël Avila <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: jnavila

Documentation/git-commit.txt

@@ -8,7 +8,7 @@ git-commit - Record changes to the repository
 SYNOPSIS
 --------
 [synopsis]
-git commit [-a | --interactive | --patch] [-s] [-v] [-u<mode>] [--amend]
+git commit [-a | --interactive | --patch] [-s] [-v] [-u[<mode>]] [--amend]
 	   [--dry-run] [(-c | -C | --squash) <commit> | --fixup [(amend|reword):]<commit>]
 	   [-F <file> | -m <msg>] [--reset-author] [--allow-empty]
 	   [--allow-empty-message] [--no-verify] [-e] [--author=<author>]

builtin/commit.c

@@ -44,7 +44,7 @@
 #include "trailer.h"
 
 static const char * const builtin_commit_usage[] = {
-	N_("git commit [-a | --interactive | --patch] [-s] [-v] [-u<mode>] [--amend]\n"
+	N_("git commit [-a | --interactive | --patch] [-s] [-v] [-u[<mode>]] [--amend]\n"
 	   "           [--dry-run] [(-c | -C | --squash) <commit> | --fixup [(amend|reword):]<commit>]\n"
 	   "           [-F <file> | -m <msg>] [--reset-author] [--allow-empty]\n"
 	   "           [--allow-empty-message] [--no-verify] [-e] [--author=<author>]\n"