docs: update PR template

Author: mtrezza

.github/pull_request_template.md

@@ -11,7 +11,7 @@
 ### Issue Description
 <!-- Add a brief description of the issue this PR solves. -->
 
-Related issue: #`FILL_THIS_OUT`
+Closes: FILL_THIS_OUT
 
 ### Approach
 <!-- Add a description of the approach in this PR. -->
@@ -24,4 +24,3 @@ Related issue: #`FILL_THIS_OUT`
 
 - [ ] Add tests
 - [ ] Add changes to documentation (guides, repository pages, in-code descriptions)
-- [x] A changelog entry is created automatically using the pull request title (do not manually add a changelog entry)