Update CONTRIBUTING.md

Author: pokey

packages/cursorless-org-docs/src/docs/contributing/CONTRIBUTING.md

@@ -148,7 +148,7 @@ We need to keep the default cheatsheet up-to-date for use with local development
 1. Switch to vanilla community + cursorless_talon
 2. `"debug extension"`
 3. `"cursorless update cheatsheet"`
-4. See diff and cleanup if necessary
+4. See diff and cleanup if necessary. In particular, if you have shapes enabled, you'll need to remove these from the generated cheatsheet as they're not on by default
 
 This should be done every time we do something that will change the custom cheatsheet, but in practice it rots a bit so needs to be redone regularly.