update 2.1.4 release notes

Author: keith-turner

_posts/release/2025-08-20-accumulo-2.1.4.md

@@ -61,6 +61,9 @@ any prior 2.1 release.
 * {% ghi 5779 %} Admin serviceStatus command now report summaries per resource group.
 * {% ghi 5743 %} Added per table and per compaction erasure code configuration.
 * {% ghi 5720 %} Added ability to configure compactions differently per tablet and per output path.
+* {% ghi 5588 %} and {% ghi 5675 %} together these change make compaction
+  planning look ahead more than once to find sets of files to compact that
+  would not include smaller sets of files that could compact or are compacting.
 
 ### Configuration Improvements