[APIM] Clarify GQL subscription support

Author: dlepow

articles/api-management/api-management-gateways-overview.md

@@ -94,9 +94,11 @@ The following table compares features available in the managed gateway versus th
 | [Container App](import-container-app-with-oas.md) |  ✔️ | ✔️ | ✔️ |
 | [Service Fabric](../service-fabric/service-fabric-api-management-overview.md) |  Developer, Premium |  ❌ | ❌ |
 | [Pass-through GraphQL](graphql-apis-overview.md) |  ✔️ | ✔️ | ❌ |
-| [Synthetic GraphQL](graphql-apis-overview.md)|  ✔️ |  ✔️ | ❌ |
+| [Synthetic GraphQL](graphql-apis-overview.md)|  ✔️ |  ✔️<sup>1</sup> | ❌ |
 | [Pass-through WebSocket](websocket-api.md) |  ✔️ |  ❌ | ✔️ |
 
+<sup>1</sup> Synthetic GraphQL subscriptions (preview) aren't supported in the Consumption tier.
+
 ### Policies
 
 Managed and self-hosted gateways support all available [policies](api-management-policies.md) in policy definitions with the following exceptions.

articles/api-management/graphql-apis-overview.md

@@ -25,7 +25,7 @@ API Management helps you import, manage, protect, test, publish, and monitor Gra
 
 * GraphQL APIs are supported in all API Management service tiers
 * Pass-through and synthetic GraphQL APIs currently aren't supported in a self-hosted gateway
-* GraphQL subscription support in synthetic GraphQL APIs is currently in preview
+* Support for GraphQL subscriptions in synthetic GraphQL APIs is currently in preview and isn't available in the Consumption tier
 
 ## What is GraphQL?