[TASK] Rename changed method name in comments and rst

During development the method name getParserByKey of the
SoftReferenceParserFactoy class has been changed to
getSoftReferenceParser. This renames the method in some missed places.

Resolves: #94853
Releases: master
Change-Id: I554e613509a32c0331de34b618ce30f29815f948
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70504


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>