Improved Changelog

Summary:
Resolved comment from this diff https://grizzly.internal.memcompute.com/D53157

**Design doc/spec**:
**Docs impact**: none

Test Plan: None

Reviewers: carl

Reviewed By: carl

Subscribers: engineering-list

Differential Revision: https://grizzly.internal.memcompute.com/D53174

CHANGELOG

@@ -1,5 +1,5 @@
 2021-12-29 Version 3.2.0
-    * Added support of the parallel read from aggregators
+    * Added support for reading in parallel from aggregator nodes instead of leaf nodes
 
 2021-09-16 Version 3.1.3
     * Added Spark 3.1 support