modernize PR template, include chore label

On-behalf-of: @SAP christoph.mewes@sap.com

Author: xrstf

.github/pull_request_template.md

@@ -1,18 +1,26 @@
 <!--
 
 Thanks for creating a pull request!
-If this is your first time, please make sure to review CONTRIBUTING.MD.
+If this is your first time, please make sure to review CONTRIBUTING.md.
 
 -->
 
 ## Summary
+<!--
+Please provide a description that explains *why* your PR is changing something
+in the codebase, and focus less on what *what* you're changing. The following are
+good questions to ask yourself when writing the PR summary:
 
-## What Type of PR Is This?
+* What are the problems you are trying to solve?
+* What assumptions did you make when implementing your changes?
+* Which workflows will be affected/improved by your change?
+-->
 
+## What Type of PR Is This?
 <!--
-
 Add one of the following kinds:
 /kind bug
+/kind chore
 /kind cleanup
 /kind documentation
 /kind feature
@@ -23,19 +31,16 @@ Optionally add one or more of the following kinds if applicable:
 /kind failing-test
 /kind flake
 /kind regression
-
 -->
 
 ## Related Issue(s)
-
 Fixes #
 
 ## Release Notes
-
 <!--
-Please add a release note in the block below. Leave NONE only if no user-facing changes are in this PR.
+Please add a release note in the block below.
+Leave NONE only if no user-facing changes are in this PR.
 -->
-
 ```release-note
 NONE
 ```