docs: add docs change type to PR template

Author: glenwinters

.github/PULL_REQUEST_TEMPLATE.md

@@ -14,6 +14,7 @@ What kind of change does this PR introduce?
 [ ] Code style update (formatting, local variables)
 [ ] Refactoring (no functional changes, no api changes)
 [ ] Build related changes
+[ ] Docs
 [ ] Other... Please describe:
 ```
 
@@ -35,4 +36,4 @@ Issue Number: N/A
 <!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. -->
 
 
-## Other information
+## Other information