docs: fix dead link in pull request template
@@ -5,6 +5,6 @@ Thank you for proposing a pull request. This template will guide you through the
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Make sure that:
-- [ ] You have read the [contribution guidelines](https://shenyu.apache.org/community/contributor).
+- [ ] You have read the [contribution guidelines](https://shenyu.apache.org/community/contributor-guide).
- [ ] You submit test cases (unit or integration tests) that back your changes.
- [ ] Your local test passed `mvn clean install -Dmaven.javadoc.skip=true`.
