Update docs/reference/release-notes/8.16.4.asciidoc

Co-authored-by: Liam Thompson <[email protected]>

docs/reference/release-notes/8.16.4.asciidoc

@@ -45,4 +45,4 @@ Ingest Node::
 
 ES|QL::
 
-* `VALUES` aggregate function can run for a long, long time when collecting many, many groups. Hundreds of thousands of groups can run on one thread for many minutes and millions of groups run for days. It is O(n^2^) with the number of groups. These will not respond to the tasks cancellation API the whole time. Fixed by {es-pull}#123073[#123073] and available in 8.16.5, 8.17.3, 8.18.0, and all releases after that.
+* The `VALUES` aggregate function can run for an extremely long time when collecting many groups. Processing hundreds of thousands of groups may take several minutes on a single thread, while processing millions of groups can take days. The function has O(n^2) complexity with respect to the number of groups. During execution, these operations will not respond to the tasks cancellation API. This issue has been fixed by {es-pull}#123073[#123073] and the fix is available in versions 8.16.5, 8.17.3, 8.18.0, and all releases after that.