docs: Add Trino fixes

Author: Techassi

modules/ROOT/partials/release-notes/release-26.3.adoc

@@ -235,6 +235,11 @@ When the log file reached a size of 5 MB, an error message repeatedly appeared i
 With this release, we have resolved the permissions issue, ensuring that the log file rollover works correctly.
 Fixed in https://github.com/stackabletech/opensearch-operator/issues/106[opensearch-operator#106].
 
+===== Trino
+
+The `spec.connector.iceberg.metastore` field in TrinoCatalog is now optional, as Iceberg also supports other catalogs, such as a REST catalog, which (currently) can only be added using configOverrides.
+Fixed in https://github.com/stackabletech/trino-operator/pull/841[trino-operator#841].
+
 
 ==== Supported versions