chore: update PR template to discourage incomplete OPs

Author: kgryte

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,23 +1,20 @@
-Resolves # .
+Resolves #{{TODO: add issue number}}.
 
 ## Description
 
 > What is the purpose of this pull request?
 
 This pull request:
 
--   a
--   b
--   c
+-   {{TODO: add description describing what this pull request does}}
 
 ## Related Issues
 
 > Does this pull request have any related issues?
 
 This pull request:
 
--   resolves #
--   fixes #
+-   resolves #{{TODO: add issue number}} 
 
 ## Questions