Fix pickle parser

Author: donBarbos

Doc/library/pickle.rst

@@ -524,7 +524,7 @@ is a safer option because it does not execute pickle bytecode, see
 
 .. code-block:: bash
 
-   python -m pickle pickle_file
+   python -m pickle pickle_file [pickle_file ...]
 
 The following option is accepted:
 

Lib/pickle.py

@@ -1913,7 +1913,7 @@ def _loads(s, /, *, fix_imports=True, encoding="ASCII", errors="strict",
         description='display contents of the pickle files')
     parser.add_argument(
         'pickle_file',
-        nargs='*', help='the pickle file')
+        nargs='+', help='the pickle file')
     args = parser.parse_args()
     if not args.pickle_file:
         parser.print_help()