Refresh the template to include isntrustion how to format the code

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,7 +5,7 @@ Make sure that:
 
 - [ ] You have read the [contribution guidelines](https://github.com/lettuce-io/lettuce-core/blob/main/.github/CONTRIBUTING.md).
 - [ ] You have created a feature request first to discuss your contribution intent. Please reference the feature request ticket number in the pull request.
-- [ ] You use the code formatters provided [here](https://github.com/lettuce-io/lettuce-core/blob/main/formatting.xml) and have them applied to your changes. Don’t submit any formatting related changes.
+- [ ] You applied code formatting rules using the `mvn formatter:format` target. Don’t submit any formatting related changes.
 - [ ] You submit test cases (unit or integration tests) that back your changes.
 
  <!--