adding more use-cases to the roadmap

Author: asoorm

docs/connect/client.mdx

@@ -208,3 +208,5 @@ The following features are planned for future releases of Connect Client:
 
 1.  **OpenAPI Generation**: Enhanced support for generating OpenAPI specifications including descriptions, summaries, deprecated fields, and tags.
 2.  **Subscription Support**: Ability to consume GraphQL subscriptions as gRPC streams, enabling real-time data updates over the Connect protocol.
+3.  **Multiple Root Fields**: Support for executable operations containing multiple root selection set fields, allowing more complex queries in a single operation.
+4.  **Field Aliases**: Support for GraphQL aliases to control the shape of the API surface, enabling customized field names in the generated Protobuf definitions.