[BUGFIX] Correct old naming "Text w/image" into "Text & Images"

The content element was renamed long time ago, so the documentation
should be updated.

Resolves: #22914
Releases: 6.2
Change-Id: Ia2948c8fe7b9f9ca2b348773546ebf0b1e9718b1
Reviewed-on: https://review.typo3.org/25421
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny