updated release note formatting

[ci skip]

.github/workflows/release.yml

@@ -618,5 +618,7 @@ jobs:
             ---
             :scroll: A complete list of closed issues is available [here](LINK)
             ---
-            Checksums of release artifacts:
+            :floppy_disk: SHA-256 checksums of release artifacts:
+            ```
             ${{ env.SHA256_SUMS }}
+            ```