Merge pull request #6484 from RainbowMango/pr_enhance_prtemplate

improve pull request template

Author: karmada-bot

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,30 +2,48 @@
 
 <!--
 Add one of the following kinds:
-
-/kind api-change
 /kind bug
+/kind feature
+/kind documentation
 /kind cleanup
+
+Optionally add one or more of the following kinds if applicable:
+/kind api-change
 /kind deprecation
-/kind design
-/kind documentation
 /kind failing-test
-/kind feature
 /kind flake
+/kind regression
 
 -->
 
 **What this PR does / why we need it**:
 
 **Which issue(s) this PR fixes**:
+<!--
+*Automatically closes linked issue when PR is merged.
+Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.*
+-->
 Fixes #
 
+<!--
+*Optionally link to the umbrella issue if this PR resolves part of it.
+Usage: `Part of #<issue number>`, or `Part of (paste link of issue)`.*
+Part of #
+-->
+
 **Special notes for your reviewer**:
+<!--
+Such as a test report of this PR.
+-->
 
 **Does this PR introduce a user-facing change?**:
 <!--
 If no, just write "NONE" in the release-note block below.
 If yes, a release note is required.
+Some brief examples of release notes:
+1. `karmada-controller-manager`: Fixed the issue that xxx
+2. `karmada-scheduler`: The deprecated flag `--xxx` now has been removed. Users of this flag should xxx.
+3. `API Change`: Introduced `spec.<field>` to the PropagationPolicy API for xxx.
 -->
 ```release-note