[DOCS] Proofreading and moving of feature rst files for 7.4 Part 2

Official documentations have been updated according to rst-files 
mentioned here

Resolves: #68752
Releases: master
Change-Id: Ic9c4142807bae35b05d1d577c3b601ef70a181d6
Reviewed-on: http://review.typo3.org/42273


Reviewed-by: Daniel Maier <dani-maier@gmx.de>
Tested-by: Daniel Maier <dani-maier@gmx.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>