zephyr: zmake: Clean up metavar for subcommand positional
Setting a metavar here clears up the usage text slightly.  Also expand
out on that help string slightly.
BRANCH=none
TEST=output of "zmake --help"
@@ -157,7 +157,11 @@ def get_argparser():
"--zephyr-base", type=pathlib.Path, help="Path to Zephyr OS repository"
)
- sub = parser.add_subparsers(dest="subcommand", help="Subcommand")
+ sub = parser.add_subparsers(
+ dest="subcommand",
+ metavar="subcommand",
+ help="Subcommand to run",
+ )
sub.required = True
configure = sub.add_parser(
