fix(25.3.0): Add .adoc extension to xref

Author: Techassi

modules/ROOT/partials/release-notes/release-25.3.adoc

@@ -14,7 +14,7 @@ Released on 2025-03-21.
 * Operators deployed by Helm will contain an extra pod annotation: `checksum/config`.
   This field triggers a rollout of Deployments when the ConfigMap contents change.
 * Operators for Java products now support setting JVM arguments.
-  See the xref:concepts:overrides[override concept page] and https://github.com/stackabletech/issues/issues/584[issues#584].
+  See the xref:concepts:overrides.adoc[override concept page] and https://github.com/stackabletech/issues/issues/584[issues#584].
 
 ===== Authorization