gh-84116: Docs: Document help and aliases for argparse.add_parser() (#140574)

* gh-140281: Doc: Update free-threading how-to

* gh-140281: Doc: Update free-threading how-to

* Fix trailing whitespace

* doc fixing of the cpython fixes#84116

* Docs: Document help and aliases for argparse.add_parser() (gh-84116)

* Docs: Document help and aliases for argparse.add_parser() (gh-84116)

* Fix trailing whitespace

* Fix trailing whitespace

* Fix trailing whitespace

* Fix trailing whitespace

* Fix trailing whitespace

* Fix trailing whitespace

* Fix trailing errors

* Fix trailing errors and spaces

* Fix docutils formatting, NEWS ref, and trailing whitespace

* Docs: Update argparse.rst and add NEWS entry

* Delete Doc/howto/free-threading-python.rst

* Delete Misc/NEWS.d/next/Documentation/2025-10-25-00-49-43.gh-issue-140281.tuMQUe.rst

* adding the depreceated tag

* The error indexing was fixed

* Fix trailing whitespace

* Restore missing free-threading documentation

* fixing some minor error

* fixing some minor error part 2

* fixing some minor error part 3

* Fix NEWS entry format

* Final cleanup of NEWS entry format 2

* changes in the argparse.rst

* Remove unnecessary NEWS entry

* Fixing the issue as requested

* Added the Changes done before.

* done the changes

* done the changes#1

* Apply suggestion from @picnixz

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* Apply suggestion from @picnixz

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* Done the changes

* Done the new changes

* The versionadded is rectified

* Update Doc/library/argparse.rst

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>

* Docs editing

* Docs fixing whitespace

* Docs rectifiying

* little bit rectification

* Indentation rectification

* Indentation rectification 1

* Apply suggestion from @picnixz

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* deprecated rectification

* Remove mistakenly added NEWS entry

* Update Doc/library/argparse.rst

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* changes #1

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* Update Doc/library/argparse.rst 2

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* removed useless thing

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* changed according to the request

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* Updated the test part

---------

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>