[DOCS] Add hints to disable rendering hreflang and canonical tags

In some edge cases you may want to disable rendering of hreflang and
canonical links. We added some hints how to disable the rendering of
these tags.

Resolves: #88242
Resolves: #88140
Releases: master, 9.5
Change-Id: I197062de0031fc1bb3a21eb84ab124d3d0967f20
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62122


Tested-by: Daniel Siepmann <coding@daniel-siepmann.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Sybille Peters <sypets@gmx.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Daniel Siepmann <coding@daniel-siepmann.de>
Reviewed-by: Sybille Peters <sypets@gmx.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>