gh-103582: Remove last references to argparse.REMAINDER from docs (GH-103586)

(cherry picked from commit f4d0879)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

Author: miss-islington

Doc/library/argparse.rst

@@ -67,7 +67,7 @@ default_               Default value used when an argument is not provided
 dest_                  Specify the attribute name used in the result namespace
 help_                  Help message for an argument
 metavar_               Alternate display name for the argument as shown in help
-nargs_                 Number of times the argument can be used                    :class:`int`, ``'?'``, ``'*'``, ``'+'``, or ``argparse.REMAINDER``
+nargs_                 Number of times the argument can be used                    :class:`int`, ``'?'``, ``'*'``, or ``'+'``
 required_              Indicate whether an argument is required or optional        ``True`` or ``False``
 type_                  Automatically convert an argument to the given type         :class:`int`, :class:`float`, ``argparse.FileType('w')``, or callable function
 ====================== =========================================================== ==========================================================================================================================
@@ -2186,7 +2186,7 @@ support this parsing style.
 
 These parsers do not support all the argparse features, and will raise
 exceptions if unsupported features are used.  In particular, subparsers,
-``argparse.REMAINDER``, and mutually exclusive groups that include both
+and mutually exclusive groups that include both
 optionals and positionals are not supported.
 
 The following example shows the difference between