update mysql docs

Author: miparnisari

internal/datastore/mysql/README.md

@@ -3,7 +3,3 @@
 **Minimum required version** can be found here defined as `MinimumSupportedMySQLVersion` in [version.go](version/version.go)
 
 This datastore implementation allows you to use a MySQL database as the backing durable storage for SpiceDB.
-
-## Usage Caveats
-
-The MySQL datastore only supports a single primary node, and does not support read replicas. It is therefore only recommended for installations that can scale the MySQL instance vertically and cannot be used efficiently in a mulit-region installation.