Improve the PR template after discussion with Erin

Author: gsmet

.github/pull_request_template.md

@@ -8,10 +8,10 @@ Your pull request:
 - [ ] has tests (`mvn clean test`)
 - [ ] works in native (`mvn clean package -Pnative`)
 - [ ] has native tests (`mvn clean verify -Pnative`)
-- [ ] makes sure the documentation must not be updated
-- [ ] links the documentation update pull request (if needed)
+- [ ] makes sure the associated guide must not be updated
+- [ ] links the guide update pull request (if needed)
 - [ ] updates or creates the `README.md` file (with build and run instructions)
-- [ ] For new quickstart, is located in the directory _component-quickstart_
-- [ ] For new quickstart, is added to the root `pom.xml` and `README.md`
+- [ ] for new quickstart, is located in the directory _component-quickstart_
+- [ ] for new quickstart, is added to the root `pom.xml` and `README.md`