Add comment for release note stuff
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
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+*Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.*
+
+*List which issues are fixed by this PR. You must list at least one issue.*
+
+*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*
+
+<!-- Uncomment and modify the following section if your PR does not require changes to the release notes -->
+<!-- 
+> NO RELEASE NOTE CHANGES: <REASON GOES HERE>
+ -->
+
+## Pre-launch Checklist
+
+- [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
+- [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities.
+- [ ] I read the [Flutter Style Guide] _recently_, and have followed its advice.
+- [ ] I signed the [CLA].
+- [ ] I listed at least one issue that this PR fixes in the description above.
+- [ ] I updated/added relevant documentation (doc comments with `///`).
+- [ ] I added new tests to check the change I am making, or this PR is [test-exempt].
+- [ ] All existing and new tests are passing.
+
+If you need help, consider asking for advice on the #hackers-new channel on [Discord].
+
+<!-- Links -->
+[Contributor Guide]: https://github.com/flutter/flutter/wiki/Tree-hygiene#overview
+[Tree Hygiene]: https://github.com/flutter/flutter/wiki/Tree-hygiene
+[test-exempt]: https://github.com/flutter/flutter/wiki/Tree-hygiene#tests
+[Flutter Style Guide]: https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
+[CLA]: https://cla.developers.google.com/
+[flutter/tests]: https://github.com/flutter/tests
+[breaking change policy]: https://github.com/flutter/flutter/wiki/Tree-hygiene#handling-breaking-changes
+[Discord]: https://github.com/flutter/flutter/wiki/Chat
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