docs: cleanup after requestAnimationFrame example

[dvdkouril]

Quick sketch of the scenario where you use the cleanup function returned from render() to call cancelAnimationFrame to break the continuously updating frameloop.

I still want to think about whether this is the most minimal and expressive code example (that's why I'm keeping it a draft). There also might be a better way to word the description.

[changeset-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.36%. Comparing base (12ca2f8) to head (f55a16c).
Report is 97 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #536      +/-   ##
==========================================
- Coverage   98.45%   97.36%   -1.09%     
==========================================
  Files           8        8              
  Lines         452      494      +42     
==========================================
+ Hits          445      481      +36     
- Misses          7       13       +6     

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[manzt]

Just a small comment. Thanks for the contribution!