Merge branch 'js/merge-tree-3-trees'

Match the option argument type in the help text to the correct type
updated by a recent series.

* js/merge-tree-3-trees:
  merge-tree: fix argument type of the `--merge-base` option

builtin/merge-tree.c

@@ -563,7 +563,7 @@ int cmd_merge_tree(int argc, const char **argv, const char *prefix)
 			   PARSE_OPT_NONEG),
 		OPT_STRING(0, "merge-base",
 			   &merge_base,
-			   N_("commit"),
+			   N_("tree-ish"),
 			   N_("specify a merge-base for the merge")),
 		OPT_STRVEC('X', "strategy-option", &xopts, N_("option=value"),
 			N_("option for selected merge strategy")),