Revise PR template for clarity and correctness (#15)

Updated wording for clarity and fixed typo in instructions.

Author: DimsumPanda

PULL_REQUEST_TEMPLATE.md

@@ -4,14 +4,14 @@
 
 <!-- Please provide a summary of the changes in the PR under the Summary header. -->
 
-## Have you confirmed the website builds locally with your chapters?
+## Have you confirmed the website builds locally with your changes?
 
 <!-- Mark which one is correct with an [X]. -->
 
 - [ ] Yes
 - [ ] No
 
-To run the website bulid locally:
+To run the website build locally:
 ```
 $ cd /root-of-forked-directory
 $ python -m http.server # Defaults to port 8000, you can change by providing an additional integer for the desired port