Update argparse documentation

src/smgdc/app.py

@@ -35,15 +35,43 @@ class BracedTemplate(string.Template):
 def main() -> None:
     parser = argparse.ArgumentParser()
 
-    parser.add_argument("validation_path", metavar="config", type=pathlib.Path)
     parser.add_argument(
-        "--add-binary", dest="bin_mounts", type=BinaryMountSpec, action="append"
+        "validation_path",
+        metavar="config",
+        type=pathlib.Path,
+        help="Single INI file for validation or directory containing multiple INI files",
+    )
+    parser.add_argument(
+        "--add-binary",
+        dest="bin_mounts",
+        type=BinaryMountSpec,
+        action="append",
+        help="Path to a code binary that may be used for validation",
+    )
+    parser.add_argument(
+        "-o",
+        "--output-directory",
+        type=pathlib.Path,
+        help="Directory to place processed templates",
+    )
+    parser.add_argument(
+        "--match",
+        dest="matches",
+        type=str,
+        action="append",
+        help="Filters configs to only those that match the given substring",
+    )
+    parser.add_argument(
+        "--fail-fast",
+        action="store_true",
+        help="Stops processing this and other configs if a validation failure is received",
+    )
+    parser.add_argument(
+        "--only-failures", action="store_true", help="Only show failures for readability"
+    )
+    parser.add_argument(
+        "--show-summary", action="store_true", help="Outputs a list of changed files"
     )
-    parser.add_argument("-o", "--output-directory", type=pathlib.Path)
-    parser.add_argument("--match", dest="matches", type=str, action="append")
-    parser.add_argument("--fail-fast", action="store_true")
-    parser.add_argument("--only-failures", action="store_true")
-    parser.add_argument("--show-summary", action="store_true")
 
     args = parser.parse_args()