Inconsistent error messages between parse_args and documentation

### Documentation While working on #155339, I found out an inconsistency between what is actually being output and [the documentation](https://docs.python.org/3.15/library/argparse.html#arguments-containing). The actual output (current main): ```python >>> import argparse >>> parser = argparse.ArgumentParser(prog='PROG') >>> parser.add_argument('-1', dest='one') >>> parser.add_argument('foo', nargs='?') >>> parser.parse_args(['-2']) usage: PROG [-h] [-1 ONE] [foo] PROG: error: unrecognized arguments: -2 ``` While in the documentation: ```python # 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 ``` So it should be 'unrecognized arguments' instead of 'no such option'. Searching for 'no such option' in the docs and it reveals two more similar inconsistence instances, in the ['Invalid arguments' section just above](https://docs.python.org/3.15/library/argparse.html#invalid-arguments): ```python # invalid option parser.parse_args(['--bar']) usage: PROG [-h] [--foo FOO] [bar] PROG: error: no such option: --bar # should be 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 # should be PROG: error: unrecognized arguments: badger ``` A little bit of digging shows that these inconsistencies have been here for ~15-16 years, and [this change in the original argparse](https://github.com/ThomasWaldmann/argparse/commit/0ed53b62ae437484d0fe69177cae2b1619fedb8f) did not include the relevant changes in the documentation, and it looks like this has been carried over. To be honestly I quite like the original error messages as it is clearer, but given it has been here for ~15-16 years, I think the sensible way is to just change the documentation for consistency, as a lot of downstream application/CI may catch the error/match the error messages. <!-- gh-linked-prs --> ### Linked PRs * gh-155353 * gh-155355 * gh-155356 * gh-155357 <!-- /gh-linked-prs -->