fixup: release notes to refer to 6622

Co-authored-by: thephez <thephez@users.noreply.github.com>

Author: PastaPastaPasta

doc/release-notes.md

@@ -29,7 +29,7 @@ likely require a reindex.
 Quorum Rotation Improvements
 ----------------------------
 
-- Optimized `quorum rotationinfo` RPC and `GETQUORUMROTATIONINFO` P2P message by constructing diffs progressively from oldest to newest, reducing redundancy and improving efficiency (dash#6587).
+- Optimized `quorum rotationinfo` RPC and `GETQUORUMROTATIONINFO` P2P message by constructing diffs progressively from oldest to newest, reducing redundancy and improving efficiency (dash#6622).
 - Fixed incorrect `baseBlockHash` handling, eliminating unnecessary quorum changes in responses and improving result accuracy and compactness (dash#6625).
 
 Deployment and CI Fixes