docs(caching): minor update to Streaming Pre-Aggregations support

Author: hassankhan

docs/content/Caching/Using-Pre-Aggregations.mdx

@@ -763,14 +763,8 @@ Currently, Cube supports only one streaming data source -
 [ksqlDB](/config/databases/ksqldb). All pre-aggregations where data source is
 ksqlDB are streaming.
 
-We’re working on supporting streaming pre-aggregations for the following data
-sources -
-
-- Materialize
-- Flink SQL
-- Spark Streaming
-
-Please [let us know](https://cube.dev/contact) if you are interested in early
+We are working on supporting more data sources for streaming pre-aggregations,
+please [let us know](https://cube.dev/contact) if you are interested in early
 access to any of these drivers or would like Cube to support any other SQL
 streaming engine.