[DOCS] Remove duplicate number sign

Also fixes a non-existing link that is generated:
https://forge.typo3.org/issues/#93436 becomes
https://forge.typo3.org/issues/93436

Releases: main, 11.5
Resolves: #97617
Change-Id: Ic30261223d0cbe5d48a2e88fa87713ba3a698db2
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74616


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>