chore(docs): update PR template to simplify commit descriptions

Author: ayushmanchhabra

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,9 +1,11 @@
-### Description of Changes
+<!-- Description of Changes -->
 
-- ...
+* 
 
 <!-- Notes: additional context on why this PR is being merged when it doesn't seem like it should -->
 
 <!-- Fixes: # -->
 <!-- Closes: # -->
 <!-- Refs: # -->
+
+<!-- Note: Remove all markdown comments after creating the pull request -->