Remove openstack swift experimental (#6316)

Signed-off-by: SungJin1212 <[email protected]>

Author: SungJin1212

docs/architecture.md

@@ -30,7 +30,7 @@ The blocks storage doesn't require a dedicated storage backend for the index. Th
 * [Amazon S3](https://aws.amazon.com/s3)
 * [Google Cloud Storage](https://cloud.google.com/storage/)
 * [Microsoft Azure Storage](https://azure.microsoft.com/en-us/services/storage/)
-* [OpenStack Swift](https://wiki.openstack.org/wiki/Swift) (experimental)
+* [OpenStack Swift](https://wiki.openstack.org/wiki/Swift)
 * [Local Filesystem](https://thanos.io/storage.md/#filesystem) (single node only)
 
 For more information, please check out the [Blocks storage](./blocks-storage/_index.md) documentation.