Refine PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

@@ -9,7 +9,7 @@ Link the issue that will be closed, e.g., "Closes #333". If your PR closes a kop
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 - [x] I own the copyright of the code submitted and I licence it under the [MIT license](https://github.com/JabRef/jabref/blob/main/LICENSE)
-- [ ] Change in `CHANGELOG.md` described in a way that is understandable for the average user (if applicable)
+- [ ] Change in `CHANGELOG.md` described in a way that is understandable for the average user (if change is visible to the user)
 - [ ] Tests created for changes (if applicable)
 - [ ] Manually tested changed features in running JabRef (always required)
 - [ ] Screenshots added in PR description (for UI changes)