Node.js: disclaimer for streaming apis (#2050)

Author: johannes-vogel

node.js/cds-ql.md

@@ -738,6 +738,10 @@ Since the SELECT query implements the async iterator protocol, you can also use
 for await (const book of SELECT.from(Books)) { ... }
 ```
 
+:::warning Streaming APIs only implemented by Database Services
+As of now, `SELECT.foreach()` and `SELECT.pipeline()` are only supported by `cds.DatabaseService`. `cds.RemoteService` does not support the streaming APIs yet.
+:::
+
 ## INSERT {.class}
 
 Fluent API to construct [CQN INSERT](../cds/cqn#insert) query objects in a [CQL](../cds/cql)/SQL-like style. In contrast to SQL, though, the clauses can be arrayed in arbitrary order.

node.js/core-services.md

@@ -1065,7 +1065,7 @@ function foreach(
 
 Executes the statement and processes the result set row by row. Use this API instead of [`cds.run`](#srv-run-query) if you expect large result sets. Then they're processed in a streaming-like fashion instead of materializing the full result set in memory before processing.
 
-> Please note that this API is only implemented by `cds.DatabaseService`. For all other subclasses, the full result set is currently materialized in memory.
+> As of now, this API is only implemented by `cds.DatabaseService`. For all other subclasses, the full result set is currently materialized in memory.
 
 _**Common Usage:**_