fix: Raise exception with details on failing migration [DHIS2-12600]

dhis-2/dhis-support/dhis-support-db-migration/src/main/resources/org/hisp/dhis/db/migration/2.42/V2_42_28__Make_ou_event_and_enrollment_not_null.sql

@@ -12,7 +12,7 @@ BEGIN
 
 EXCEPTION
   WHEN not_null_violation THEN
-    RAISE EXCEPTION 'There are inconsistent data in your DB. Please check https://github.com/dhis2/dhis2-releases/blob/master/releases/2.42/migration-notes.md to have more information on the issue and to find ways to fix it. Detailed error message: %', SQLERRM;
+    RAISE EXCEPTION 'There are inconsistent data in your DB. Please check https://github.com/dhis2/dhis2-releases/blob/master/releases/2.42/migration-notes.md#null-organisation-unit to have more information on the issue and to find ways to fix it. Detailed error message: %', SQLERRM;
 
 END;
 $$;