docs(release-notes): refine v0.186.2 bullet wording

Signed-off-by: Doc Holiday <docholiday@example.com>

Signed-off-by: Doc Holiday <doc@doc.holiday>

Author: sg-doc-holiday[bot]

RELEASE_NOTES.md

@@ -15,13 +15,13 @@ This release tightens duplicate-member validation in Dijkstra and Conway tagged
 
 ### Bug Fixes
 
-* Fixed duplicate-member validation in Dijkstra and Conway tagged set decoding and added negative fixtures for duplicate witness, redeemer, sub-transaction, input, and guard set members.
+* Strengthened duplicate-member validation in Dijkstra and Conway tagged set decoding and added negative fixtures for duplicate witness, redeemer, sub-transaction, input, and guard set members.
 
 * Improved pre-Conway `MultiAsset` decoding to accept duplicate `PolicyID` and `AssetName` keys with last-wins behavior while Conway and Dijkstra still reject duplicate `MultiAsset` keys after decode.
 
 ### Additional Changes
 
-* Updated the prior `v0.186.1` release note wording for clarity and consistency.
+* Refined the prior `v0.186.1` release note wording for clarity and consistency.
 
 ## v0.186.1