Update PULL_REQUEST_TEMPLATE.md (#14935)

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,4 +5,4 @@
 - [x] Make sure there is a [GitHub_issue](https://github.com/apache/dubbo/issues) field for the change.
 - [x] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
 - [x] Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in [dubbo samples](https://github.com/apache/dubbo-samples) project.
-- [x] Make sure gitHub actions can pass. [Why the workflow is failing and how to fix it?](./CONTRIBUTING.md)
+- [x] Make sure gitHub actions can pass. [Why the workflow is failing and how to fix it?](../CONTRIBUTING.md)