chore: update RR restrictions (#29429)

Author: darora

apps/docs/content/guides/platform/read-replicas.mdx

@@ -50,7 +50,9 @@ Projects must meet these requirements to use Read Replicas:
 
 ## Getting started
 
-To add a Read Replica, go to the [Infrastructure Settings page](/dashboard/project/_/settings/infrastructure) in your dashboard. Each project can deploy up to two Read Replicas and all Read Replicas inherit the compute size of their Primary database.
+To add a Read Replica, go to the [Infrastructure Settings page](/dashboard/project/_/settings/infrastructure) in your dashboard.
+
+Projects on an XL compute add-on or larger can create up to five Read Replicas. Projects on compute add-ons smaller than XL can create up to two Read Replicas. All Read Replicas inherit the compute size of their Primary database.
 
 ### Deploying a Read Replica