github: move pull request template tip into comment
@@ -31,20 +31,21 @@ Pick one of the following and delete the others:
<!--
Please select the tests that you ran to verify your changes:
-->
-- [ ] Unit test
-- [ ] Integration test
-- [ ] Manual test (add detailed scripts or steps below)
-- [ ] No code
+- Unit test
+- Integration test
+- Manual test (add detailed scripts or steps below)
+- No code
### Does this PR affect documentation (docs) or should it be mentioned in the release notes?
-
+<!--
- If there is a document change, please file a PR in ([docs](https://github.com/tikv/website/tree/master/content)) and add the PR number here.
- If this PR should be mentioned in the release note, please update the [release notes](https://github.com/tikv/tikv/blob/master/CHANGELOG.md).
+-->
### Does this PR affect `tidb-ansible`?
-
+<!--
If there is a configuration or metrics change, please file a PR in [tidb-ansible](https://github.com/pingcap/tidb-ansible), and add the PR number here.
-
+-->
### Refer to a related PR or issue link (optional)
### Benchmark result if necessary (optional)
