gh-144835: Added missing explanations for some parameters in glob and iglob. (#144836)

* Added missing explanations for some parameters in glob and iglob.

* News entry.

* Added proper 'func' indication in News file.

* Consistent use of backticks.

* Improved wording.

* consistent wording between the two docstrings

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Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>