[TASK] Add ReST file for global namespace scoping

Resolves: #94983
Related: #94280
Releases: master
Change-Id: Ifb2b8a967de9345e900ad07f9a20fc7ef24e2918
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70744


Tested-by: Simon Gilli <typo3@gilbertsoft.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Simon Gilli <typo3@gilbertsoft.org>
Reviewed-by: crell <larry@garfieldtech.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>