Digital Ocean Spaces now supports AWS v4 streaming API

See https://github.com/fog/fog-aws/issues/428#issuecomment-360869183

doc/raketasks/backup_restore.md

@@ -169,15 +169,11 @@ For Omnibus GitLab packages:
 
 1. [Reconfigure GitLab] for the changes to take effect
 
-#### Digital Ocean Spaces and other S3-compatible providers
+#### Digital Ocean Spaces
 
-Not all S3 providers are fully-compatible with the Fog library. For example,
-if you see `411 Length Required` errors after attempting to upload, you may
-need to downgrade the `aws_signature_version` value from the default value to
-2 [due to this issue](https://github.com/fog/fog-aws/issues/428).
+This example can be used for a bucket in Amsterdam (AMS3).
 
-1. For example, with [Digital Ocean Spaces](https://www.digitalocean.com/products/spaces/),
-this example configuration can be used for a bucket in Amsterdam (AMS3):
+1. Add the following to `/etc/gitlab/gitlab.rb`:
 
     ```ruby
     gitlab_rails['backup_upload_connection'] = {
@@ -185,7 +181,6 @@ this example configuration can be used for a bucket in Amsterdam (AMS3):
       'region' => 'ams3',
       'aws_access_key_id' => 'AKIAKIAKI',
       'aws_secret_access_key' => 'secret123',
-      'aws_signature_version' => 2,
       'endpoint'              => 'https://ams3.digitaloceanspaces.com'
     }
     gitlab_rails['backup_upload_remote_directory'] = 'my.s3.bucket'
@@ -193,6 +188,13 @@ this example configuration can be used for a bucket in Amsterdam (AMS3):
 
 1. [Reconfigure GitLab] for the changes to take effect
 
+#### Other S3 Providers
+
+Not all S3 providers are fully-compatible with the Fog library. For example,
+if you see `411 Length Required` errors after attempting to upload, you may
+need to downgrade the `aws_signature_version` value from the default value to
+2 [due to this issue](https://github.com/fog/fog-aws/issues/428).
+
 ---
 
 For installations from source: