docs: add note on Redis service plan availability (#15004)

Added note about Redis service availability for plans.

Author: shahednasser

www/apps/cloud/app/redis/page.mdx

@@ -6,6 +6,12 @@ export const metadata = {
 
 In this guide, you'll learn about the managed Redis service that Medusa provides as part of your project environments on Cloud.
 
+<Note>
+
+The Redis service is only available for Launch, Scale, and Enterprise plans. If you're on the Developer plan, please upgrade to start using Redis in your Cloud projects.
+
+</Note>
+
 ## Managed Redis Service on Cloud
 
 Medusa provisions and manages Redis servers for each of your environments on Cloud.
@@ -53,4 +59,4 @@ Then, configure the modules and providers you're overriding in your `medusa-conf
 
 To set the connection URL of your external Redis instance, refer to the [Manage Environment Variables](../environments/environment-variables/page.mdx) guide to learn how to add environment variables. You can then use these variables in your `medusa-config.ts` file to connect to your Redis instance.
 
-</Note>
+</Note>