Update PULL_REQUEST_TEMPLATE.md

Author: j4ng5y

PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,4 @@
-##IMPORTANT: Please do not create a Pull Request without creating an issue first.
+## IMPORTANT: Please do not create a Pull Request without creating an issue first.
 
 Any change needs to be discussed before proceeding. Failure to do so may result in the rejection of the pull request.
 
@@ -9,4 +9,4 @@ Please provide enough information so that others can review your pull request:
 * Code formatting
 * Closing issues
 
-Put closes #XXXX in your comment to auto-close the issue that your PR fixes (if such).
+Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if such).