[DOCS] Link to issues in category "Redirects Handling"

The redirects documentation contains a link to the issues on the
page "Known problems", using a category filter.

This used to be "Link Handling, Site Handling & Routing", but
redirects now have their own category "Redirects Handling", so
we use this.

Resolves: #101260
Releases: main, 12.4, 11.5
Change-Id: Ife6c4bbd7b2db1476054d5ce2558f84f32ab4800
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79829


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>