[DOCS] Remove obsolete debugging hint

With Feature #90052 the parsed YAML configuration can be viewed
in the Configuration module. A tip is already available on the
top of the page. The hint about manual debugging is therefore
obsolete and can be removed.

Resolves: #90432
Related: #90052
Releases: master
Change-Id: Iff3e1ae0e15a30e679e8ca29fb5e54714d21f925
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63320


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Daniel Siepmann <coding@daniel-siepmann.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Siepmann <coding@daniel-siepmann.de>