Merge branch 'patch-9' into 'master'

Change docker backup command in readme

See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html

## What does this MR do?

MR fixes wrong order of parameters in the command given for backing up gitlab in a docker container

## Moving docs to a new location?

No

See merge request !7468

doc/raketasks/backup_restore.md

@@ -32,7 +32,7 @@ sudo -u git -H bundle exec rake gitlab:backup:create RAILS_ENV=production
 ```
 If you are running GitLab within a Docker container, you can run the backup from the host:
 ```
-docker -t exec <container name> gitlab-rake gitlab:backup:create
+docker exec -t <container name> gitlab-rake gitlab:backup:create
 ```
 
 You can specify that portions of the application data be skipped using the