Removed checklist and added comment to pull request template (#2802)

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

---------

Co-authored-by: Phil Cohen <[email protected]>

Author: AndreasArvidsson

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,9 +1,16 @@
+<!--
+Thanks for your change!
 
+* Remember to *add tests* if you have added a new feature, or fixed a bug.
+    Use the test case recorder: https://www.cursorless.org/docs/contributing/test-case-recorder
+
+* Remember to *update the docs* if you've added a new feature.
+    Link: https://github.com/cursorless-dev/cursorless/tree/main/docs
+
+* Remember to *test the cheatsheet manually* if you've added a new action,
+  modifier, or scope -- or changed any Talon files.
+-->
 
-## Checklist
 
-- [ ] I have added [tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
-- [ ] I have updated the [docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and [cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
-- [ ] I have not broken the cheatsheet
 
 ## Release notes