better wording

Co-authored-by: Jeremy Walker <[email protected]>

.github/workflows/no-important-files-changed.yml

@@ -58,7 +58,7 @@ jobs:
         uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea
         with:
           script: |
-            const body = "This PR touches files which probably affect the outcome of the tests of an exercise. If this is not the case, please add the following to the merge-commit message. Copy-paste to avoid typos. This will prevent tests from rerunning unnecessarily. For more information, refer to the [documentation](https://exercism.org/docs/building/tracks#h-avoiding-triggering-unnecessary-test-runs).\n```\n[no important files changed]\n```"
+            const body = "This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.\n\nIf this PR does **not** affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), **please add the following to the merge-commit message** which will stops student's tests from re-running. Please copy-paste to avoid typos.\n```\n[no important files changed]\n```\n\n For more information, refer to the [documentation](https://exercism.org/docs/building/tracks#h-avoiding-triggering-unnecessary-test-runs). If you are unsure whether to add the message or not, please ping `@exercism/maintainers-admin` in a comment. Thank you!"
             github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,