Update description for read replica URI flag.mdx

pages/spicedb/concepts/commands.mdx

@@ -31,7 +31,7 @@ The following are configuration flags that can be provided to every SpiceDB comm
 | --datastore-credentials-provider-name | retrieve datastore credentials dynamically using one of the following options: aws-iam |  |
 | --datastore-engine | type of datastore to initialize ("cockroachdb", "mysql", "postgres", "spanner") | `memory` |
 | --datastore-mysql-table-prefix | prefix to add to the name of all SpiceDB database tables |  |
-| --datastore-read-replica-conn-uri | connection string used by remote datastores for read replicas (e.g. \"postgres://postgres:password@localhost:5432/spicedb\"). Only supported for postgres and mysql. |  |
+| --datastore-read-replica-conn-uri | comma-separated string of replica host URIs used by Postgres and MySQL datastores for read replicas. Note: MySQL datastores can only point to a list of replica host URIs; never use a load balancer URI. Postgres datastores can point to either a list of replica host URIs or to a load balancer |  |
 | --datastore-read-replica-credentials-provider-name | retrieve datastore credentials dynamically using one of the following options: aws-iam |  |
 | --datastore-spanner-credentials | path to service account key credentials file with access to the cloud spanner instance (omit to use application default credentials) |  |
 | --datastore-spanner-emulator-host | URI of spanner emulator instance used for development and testing (e.g. localhost:9010) |  |
@@ -78,7 +78,7 @@ This command serves the gRPC and HTTP APIs by default.
 | --datastore-prometheus-metrics | set to false to disabled prometheus metrics from the datastore | `true` |
 | --datastore-query-userset-batch-size | number of usersets after which a relationship query will be split into multiple queries | `1024` |
 | --datastore-readonly | set the service to read-only mode |  |
-| --datastore-read-replica-conn-uri | connection string used by remote datastores for read replicas; only supported for postgres and mysqls (e.g. "postgres://postgres:password@localhost:5432/spicedb\") |  |
+| --datastore-read-replica-conn-uri | comma-separated string of replica host URIs used by Postgres and MySQL datastores for read replicas. Note: MySQL datastores can only point to a list of replica host URIs; never use a load balancer URI. Postgres datastores can point to either a list of replica host URIs or to a load balancer |  |
 | --datastore-read-replica-conn-pool-read-healthcheck-interval | amount of time between connection health checks in a read-only replica datastore's connection pool | `30s` |
 | --datastore-read-replica-conn-pool-read-max-idletime | maximum amount of time a connection can idle in a read-only replica datastore's connection pool | `30m` |
 | --datastore-read-replica-conn-pool-read-max-lifetime | maximum amount of time a connection can live in a read-only replica datastore's connection pool | `30m` |