Add help text to template_name argument

Co-authored-by: Bruno Oliveira <nicoddemus@gmail.com>

scripts/release.py

@@ -105,7 +105,7 @@ def main():
     init(autoreset=True)
     parser = argparse.ArgumentParser()
     parser.add_argument("version", help="Release version")
-    parser.add_argument("template_name")
+    parser.add_argument("template_name", help="Name of template file to use for release announcement")
     parser.add_argument("--skip-check-links", action="store_true", default=False)
     options = parser.parse_args()
     pre_release(