Object Storage Documentation is inconsistent in terms of cloud provider examples

While reviewing our High Availability documentation it eventually directs you to use Object Storage if you want to reduce NFS usage:

• https://docs.gitlab.com/ee/administration/job_artifacts.html#using-object-storage

In the linked documentation pages though the cloud provider examples are inconsistent, which can cause confusion on what providers are supported or not:

• Jobs artifacts - Only AWS shown
• LFS - AWS, GCS and Rackspace shown
• Uploads - AWS, Oracle Cloud and Openstack shown
• Merge Request Diffs - Only AWS shown
• Packages - Only AWS shown
• Dependency Proxy - Only AWS shown
• Backup /restore - AWS, GCS, DigitalOcean, other S3-compatible providers

We should select a consistent list of cloud providers (AWS and GCS should be mandatory) and give examples for each in each page.