branch: change "--local" to "--list" in comment

There has never been a "git branch --local", this is just a typo for
"--list". Fixes a comment added in 23e714df91 (branch: roll
show_detached HEAD into regular ref_list, 2015-09-23).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/branch.c

@@ -726,7 +726,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 		print_current_branch_name();
 		return 0;
 	} else if (list) {
-		/*  git branch --local also shows HEAD when it is detached */
+		/*  git branch --list also shows HEAD when it is detached */
 		if ((filter.kind & FILTER_REFS_BRANCHES) && filter.detached)
 			filter.kind |= FILTER_REFS_DETACHED_HEAD;
 		filter.name_patterns = argv;