Merge branch 'stable-2.8'

* stable-2.8:
  Update the 2.8 release notes with recently merged changes
  Update documentation of the `review` command
  Fixed several spelling mistakes
  Remove deprecated approve SSH alias

Conflicts:
	Documentation/cmd-index.txt

Change-Id: Ieb4708793b0e323dcb2a68a31e59035519ec4af9