Updated Sample PR guidelines

Tweaked the checklist, since sample PRs are different from runtime PRs

.github/pull_request_template.md

@@ -4,14 +4,14 @@ _Please explain the changes you've made_
 
 ## Issue reference
 
-We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.
+We strive to have all PRs being opened based on an issue, where the problem or feature have been discussed prior to implementation.
 
 Please reference the issue this PR will close: #_[issue number]_
 
 ## Checklist
 
 Please make sure you've completed the relevant tasks for this PR, out of the following list:
 
-* [ ] Code compiles correctly
-* [ ] Created/updated tests
-* [ ] Extended the documentation
+* [ ] The sample code compiles correctly
+* [ ] You've tested new builds of the sample if you changed sample code
+* [ ] You've updated the sample's README if necessary