blockquote warning, link to guide

doc/workflow/git_annex.md

 # Git annex
 
-**Warning:** GitLab is deprecating git-annex support
+> **Warning:** GitLab is deprecating git-annex support
 from GitLab 8.17 (2017/02/22) on. It will be [completely
 removed][deprecate-annex-issue] in GitLab 9.0 (2017/03/22).
+Read through the [migration guide from git-annex to git-lfs][guide].
 
 The biggest limitation of Git, compared to some older centralized version
 control systems, has been the maximum size of the repositories.
@@ -60,7 +61,7 @@ The Omnibus package will internally set the correct options in all locations.
     gitlab_shell['git_annex_enabled'] = true
     ```
 
-1.  Save the file and [reconfigure GitLab] for the changes to take effect.
+1.  Save the file and [reconfigure GitLab][] for the changes to take effect.
 
 ### Configuration for installations from source
 
@@ -82,7 +83,7 @@ one is located in `config.yml` of gitlab-shell.
     git_annex_enabled: true
     ```
 
-1.  Save the files and [restart GitLab] for the changes to take effect.
+1.  Save the files and [restart GitLab][] for the changes to take effect.
 
 ## Using GitLab git-annex
 
@@ -170,8 +171,9 @@ push origin
 ```
 
 [deprecate-annex-issue]: https://gitlab.com/gitlab-org/gitlab-ee/issues/1648
+[git-annex]: https://git-annex.branchable.com/ "git-annex website"
 [gitlab shell]: https://gitlab.com/gitlab-org/gitlab-shell "GitLab Shell repository"
+[guide]: lfs/migrate_from_git-annex_to_git-lfs.html
 [issue]: https://git-annex.branchable.com/forum/Error_from_git-annex-shell_on_creation_of_gcrypt_special_remote/ "git-annex issue"
-[git-annex]: https://git-annex.branchable.com/ "git-annex website"
 [reconfigure GitLab]: ../administration/restart_gitlab.md#omnibus-gitlab-reconfigure
 [restart GitLab]: ../administration/restart_gitlab.md#installations-from-source