docs(async): avoid memory leak in example

[kt3k]

This reverts #4283

By using Array.fromAsync, the call result of the debounced function is stored in memory i.e. it's leaked unnecessarily. We can avoid it by not using Array.fromAsync.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.17%. Comparing base (22b4d03) to head (d1a1405).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5040   +/-   ##
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  Coverage   92.17%   92.17%           
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  Files         487      487           
  Lines       38796    38796           
  Branches     5433     5433           
=======================================
  Hits        35760    35760           
  Misses       2981     2981           
  Partials       55       55           

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