[DOCS] Proofreading and moving of feature rst files for 7.4 Part 3

Move last Important file to 7.4

Change-Id: If4dbb6f40a6b92ab114106ad0cc92820575a1af5
Resolves: #68752
Releases: master
Reviewed-on: http://review.typo3.org/42330


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Daniel Maier <dani-maier@gmx.de>
Tested-by: Daniel Maier <dani-maier@gmx.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>