Remove scary synapse-s3-storage-provider warning

docs/configuring-playbook-synapse-s3-storage-provider.md

@@ -3,8 +3,6 @@
 If you'd like to store Synapse's content repository (`media_store`) files on Amazon S3 (or other S3-compatible service),
 you can use the [synapse-s3-storage-provider](https://github.com/matrix-org/synapse-s3-storage-provider) media provider module for Synapse.
 
-**`synapse-s3-storage-provider` support is very new and still relatively untested. Using it may cause data loss.**
-
 An alternative (which has worse performance) is to use [Goofys to mount the S3 store to the local filesystem](configuring-playbook-s3-goofys.md).