Re-add 8.1 specific features to the doc (cherry picked from commit 05efea3)
Re-add 8.1 specific features to the doc
(cherry picked from commit 05efea3)

setnes/gallery,tahaalibra/gallery,desaintmartin/gallery,owncloud/galleryplus,tahaalibra/gallery,interfasys/galleryplus,setnes/galleryplus,owncloud/gallery,tahaalibra/gallery,IATkachenko/gallery,imjalpreet/gallery,viraj96/gallery,imjalpreet/gallery,desaintmartin/gallery,owncloud/galleryplus,viraj96/gallery,setnes/galleryplus,IATkachenko/gallery,interfasys/galleryplus,setnes/gallery,viraj96/gallery,desaintmartin/gallery,owncloud/gallery,imjalpreet/gallery,setnes/galleryplus,interfasys/galleryplus,owncloud/gallery,setnes/gallery,IATkachenko/gallery,owncloud/galleryplus