Update jest specs with new copy

spec/frontend/integrations/edit/components/confirmation_modal_spec.js

@@ -34,7 +34,7 @@ describe('ConfirmationModal', () => {
         'Saving will update the default settings for all projects that are not using custom settings.',
       );
       expect(findGlModal().text()).toContain(
-        'Projects using custom settings will not be impacted unless the project owner chooses to use instance-level defaults.',
+        'Projects using custom settings will not be impacted unless the project owner chooses to use parent level defaults.',
       );
     });