Added a note on recovery

Signed-off-by: Václav Muzikář <[email protected]>

docs/documentation/upgrading/topics/changes/changes-26_0_0.adoc

@@ -191,3 +191,4 @@ Starting with this release, you need to use XA datasources if you are adding add
 If the default datasource supports XA, you can do this by setting the `--transaction-xa-enabled=true` option. For additional datasources, you need to use
 the `quarkus.datasource.<your-datasource-name>.jdbc.transactions=xa` option in your `quarkus.properties` file.
 At most one datasource can be non-XA.
+Recovery isn't supported when you don't have persistent storage for the transaction store.