Update pull_request_template.md

Author: deliahu

.github/pull_request_template.md

@@ -1,11 +1,13 @@
-Closes #
+Closes #<issue ID>
 
 ---
 Checklist:
 - [ ] Run `make test` and `make lint`
-- [ ] Test end to end manually (e.g. build/push all images, restart local operator, and run `cx refresh` in an example folder)
-- [ ] Update documentation
+- [ ] Test end to end manually (e.g. build/push all images, restart operator, and run `cx refresh`)\
 - [ ] Update examples
-- [ ] Alert team if dev environment changed
+- [ ] Update documentation (add any new files to `summary.md`)
+- [ ] Merge to master
 - [ ] Cherry-pick into release branches if it's a bugfix
+- [ ] Check [gitbook](https://docs.cortex.dev/v/master/) that docs look good and links function properly
+- [ ] Alert team if dev environment changed
 - [ ] Delete the branch once it's merged