Update PULL_REQUEST_TEMPLATE.md (#5022)

When commented out, even if the PR creator forgets to remove the tips, they will not appear in the PR when it is submitted.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,19 +1,18 @@
-## *Tips*
-- *Thanks very much for contributing to Apache DolphinScheduler.*
-- *Please review https://dolphinscheduler.apache.org/en-us/community/development/pull-request.html before opening a pull request.*
+<!--Thanks very much for contributing to Apache DolphinScheduler. Please review https://dolphinscheduler.apache.org/en-us/community/development/pull-request.html before opening a pull request.-->
 
-## What is the purpose of the pull request
 
-*(For example: This pull request adds checkstyle plugin.)*
+## Purpose of the pull request
+
+<!--(For example: This pull request adds checkstyle plugin).-->
 
 ## Brief change log
 
-*(for example:)*
+<!--*(for example:)*
   - *Add maven-checkstyle-plugin to root pom.xml*
-
+-->
 ## Verify this pull request
 
-*(Please pick either of the following options)*
+<!--*(Please pick either of the following options)*-->
 
 This pull request is code cleanup without any test coverage.
 
@@ -25,8 +24,7 @@ This pull request is already covered by existing tests, such as *(please describ
 
 This change added tests and can be verified as follows:
 
-*(example:)*
-
+<!--*(example:)*
   - *Added dolphinscheduler-dao tests for end-to-end.*
   - *Added CronUtilsTest to verify the change.*
-  - *Manually verified the change by testing locally.*
+  - *Manually verified the change by testing locally.* -->