Update pull_request_template.md

Author: haikalpribadi

.github/pull_request_template.md

@@ -1,9 +1,9 @@
+Please replace every line in curly brackets ( { like this } ) with an appropriate description, and remove this line.
+
 ## What is the goal of this PR?
 
-Please reference the GitHub issues, and why the goals are valuable to achieve. Remove this line before submission.
+{ Please describe the goal of this PR, why they are valuable to achieve, and reference the related GitHub issues. }
 
 ## What are the changes implemented in this PR?
 
-Please reference the GitHub issues, and explain why your changes are the best way to achieve the goal(s) above. Remove this line before submission.
-
-If a GitHub issue will be closed with the merge of this PR, please reference them for automatic closing, such like 'closes #number'. Remove this line before submission.
+{ Please explain what you implemented, why your changes are the best way to achieve the goal(s) above, and reference the GitHub issues to be automatically closed, such like 'closes #number'. }