Merge branch 'es/worktree-add'

* es/worktree-add:
  worktree: usage: denote <branch> as optional with 'add'

Author: gitster

builtin/worktree.c

@@ -12,7 +12,7 @@
 #include "worktree.h"
 
 static const char * const worktree_usage[] = {
-	N_("git worktree add [<options>] <path> <branch>"),
+	N_("git worktree add [<options>] <path> [<branch>]"),
 	N_("git worktree prune [<options>]"),
 	N_("git worktree list [<options>]"),
 	NULL