Add notes that Git-Annex was indeed deprecated

doc/workflow/git_annex.md

 # Git annex
 
-> **Warning:** GitLab is deprecating git-annex support
-from GitLab 8.17 (2017/02/22) on. It will be [completely
+> **Warning:** GitLab has [completely
 removed][deprecate-annex-issue] in GitLab 9.0 (2017/03/22).
 Read through the [migration guide from git-annex to git-lfs][guide].
 

doc/workflow/lfs/migrate_from_git_annex_to_git_lfs.md

 # Migration guide from Git Annex to Git LFS
 
 >**Note:**
-Git Annex support [will be dropped][issue-remove-annex] with GitLab Enterprise
-Edition 9.0 which is to be released on March 22nd 2017.
+Git Annex support [has been removed][issue-remove-annex] in GitLab Enterprise
+Edition 9.0 (2017/03/22).
 
 Both [Git Annex][] and [Git LFS][] are tools to manage large files in Git.