Add a 'region' to the backup upload connection

doc/raketasks/backup_restore.md

@@ -58,6 +58,7 @@ For omnibus packages:
 ```ruby
 gitlab_rails['backup_upload_connection'] = {
   'provider' => 'AWS',
+  'region' => 'eu-west-1',
   'aws_access_key_id' => 'AKIAKIAKI',
   'aws_secret_access_key' => 'secret123'
 }
@@ -73,6 +74,7 @@ For installations from source:
       # Fog storage connection settings, see http://fog.io/storage/ .
       connection:
         provider: AWS
+        region: eu-west-1
         aws_access_key_id: AKIAKIAKI
         aws_secret_access_key: 'secret123'
       # The remote 'directory' to store your backups. For S3, this would be the bucket name.