NumPy doc style guide permits using `default` in parameter
signatures.

Fixes: pylint-dev#6211

Change `x` to `number` in test method `regression_6211`. This was
causing an `invalid-name` error.

Adds a news fragment for the issue.

Fix was for issue pylint-dev#6211. The PR that fixes this is pylint-dev#7360.

See pylint-dev#6211

* Add Marc Byrne to the maintainer team

Adds a news fragment for the issue.

The `re_only_desc` regex did not match for white and characters after
`\n`, so some description-only lines weren't getting matched. In
addition, lookaheads were added to `re_param_line` (i.e. make sure the
type group is not followed by a new line (`\n`)). Lastly, named groups
(ala Perl regular expressions) were added for slightly improved clarity.

The hyperlink in the body of test `regression_6211` was causing
problems, so this was moved into a reStructuredText directive.

Finally, the added

    `from __future__ import annotations`

moved all lines in

	`tests/functional/ext/docparams/docparams.py`

down one line, so the line numbers in `docparams.txt` were off by 1,
causing tests to fail. This was corrected.

Also remove lookahead from `re_param_line` as tests pass without it.

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