message: test-util/README.md: fix usage example
diff: @@ -20,7 +20,7 @@ The test-util package makes writing tests for your SAP Cloud Platform applicatio
  For example, you can create a mock destination for your tests by using the function `mockTestDestination`.
  ```
  -import { mockTestDestination } from '@sap-cloud-sdk/util';
  +import { mockTestDestination } from '@sap-cloud-sdk/test-util';
  mockTestDestination('mockDestinationName');
  ```
  