Update PULL_REQUEST_TEMPLATE.md (#524)

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,7 +4,8 @@
 - [ ] Make sure you are making a pull request against the **dev** branch (left side). Also you should start *your branch* off *dev*.
 - [ ] Check the commit's or even all commits' message 
 - [ ] Check if your code additions will fail linting checks
-- [ ] Remember: Add PR description to [CHANGELOG](https://github.com/Puzzlepart/prosjektportalen365/blob/dev/CHANGELOG.md) with the ID of the Issue associated with this PR
+- [ ] Remember: Add PR description to [CHANGELOG](https://github.com/Puzzlepart/prosjektportalen365/blob/dev/CHANGELOG.md) with the **ID of the Issue** associated with this PR
+- [ ] Documentation: Have a look at the [PP365 User manual](https://puzzlepart.github.io/prosjektportalen-manual/) and consider the need for updates to be made. Updates can be done directly into the 'Kladd' branch or by providing information to test team for implementation.
 
 ### Description