Update redis.md

As per https://docs.platform.sh/add-services/redis.html#service-definitionadd-services_indexmd, redis-persistent requires a disk size.
platformsh · Jan 22, 2025 · d93e373 · d93e373
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commit d93e373
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diff --git a/sites/platform/src/guides/drupal/redis.md b/sites/platform/src/guides/drupal/redis.md
@@ -49,6 +49,7 @@ To define the service, use the `redis-persistent` endpoint:
 # The name of the service container. Must be unique within a project.
 <SERVICE_NAME>:
   type: redis-persistent:<VERSION>
+  disk: 256
 ```
 
 Note that changing the name of the service replaces it with a brand new service and all existing data is lost.