Clean up according to comments

See

https://github.com/owncloud/documentation/commit/7d07fa3d58dacf524723f55b508a16c198d8eba1
https://github.com/owncloud/documentation/commit/0a9a5ccdad7174e31e41af0eae7e7a0a060bf5f6

cc @DeepDiver1975 

@karlitschek Maybe needs a backport to stable6

@DeepDiver1975 @danimo Can we have the default branch be master? And split of stable branches like in all other repos. It's quite difficult to always keep an eye on the forward port to master.