fixup - add missing entries

Author: martint

docs/src/main/sphinx/release/release-473.md

@@ -4,6 +4,8 @@
 
 * Add support for array literals. ({issue}`25301`)
 * Reduce the amount of memory required for `DISTINCT` and `GROUP BY` operations. ({issue}`25127`)
+* Improve performance of `GROUP BY` and `DISTINCT` aggregations when spilling to disk is enabled  
+  or grouping by `row`, `array`, or `map` columns ({issue}`25294`)
 * Fix failure when setting comments on columns with upper case letters. ({issue}`25297`)
 * Fix potential query failure when `retry_policy` set to `TASK` ({issue}`25217`)