Update PULL_REQUEST_TEMPLATE.md (#5597)

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,7 +3,7 @@
 1. If this is your first time, please read our contributor guidelines: https://git.k8s.io/community/contributors/guide#your-first-contribution and developer guide https://git.k8s.io/community/contributors/devel/development.md#development-guide
 2. Please label this pull request according to what type of issue you are addressing, especially if this is a release targeted pull request. For reference on required PR/issue labels, read here:
 https://git.k8s.io/community/contributors/devel/sig-release/release.md#issue-kind-label
-3. Ensure you have added or ran the appropriate tests for your PR: https://git.k8s.io/community/contributors/devel/testing.md
+3. Ensure you have added or ran the appropriate tests for your PR: https://git.k8s.io/community/contributors/devel/sig-testing/testing.md
 4. If you want *faster* PR reviews, read how: https://git.k8s.io/community/contributors/guide/pull-requests.md#best-practices-for-faster-reviews
 5. Follow the instructions for writing a release note: https://git.k8s.io/community/contributors/guide/release-notes.md
 6. If the PR is unfinished, see how to mark it: https://git.k8s.io/community/contributors/guide/pull-requests.md#marking-unfinished-pull-requests