[3.15] gh-155352: Fix inconsistent error messages between parse_args and documentation (GH-155353) (#155355)

gh-155352: Fix inconsistent error messages between parse_args and documentation (GH-155353)
(cherry picked from commit 4ccb600)

Co-authored-by: Timothy Poon <62692924+ptim0626@users.noreply.github.com>

Author: miss-islington

Doc/library/argparse.rst

@@ -1564,12 +1564,12 @@ it exits and prints the error along with a usage message::
    >>> # invalid option
    >>> parser.parse_args(['--bar'])
    usage: PROG [-h] [--foo FOO] [bar]
-   PROG: error: no such option: --bar
+   PROG: error: unrecognized arguments: --bar
 
    >>> # wrong number of arguments
    >>> parser.parse_args(['spam', 'badger'])
    usage: PROG [-h] [--foo FOO] [bar]
-   PROG: error: extra arguments found: badger
+   PROG: error: unrecognized arguments: badger
 
 
 Arguments containing ``-``
@@ -1606,7 +1606,7 @@ there are no options in the parser that look like negative numbers::
    >>> # negative number options present, so -2 is an option
    >>> parser.parse_args(['-2'])
    usage: PROG [-h] [-1 ONE] [foo]
-   PROG: error: no such option: -2
+   PROG: error: unrecognized arguments: -2
 
    >>> # negative number options present, so both -1s are options
    >>> parser.parse_args(['-1', '-1'])