docs(TestingAsyncCode.md): add note about not mixing done w/promises

[jsjoeio]

Summary

I was confused by the docs when to use done() in my tests. I thought it might be nice to mention this in the docs - don't mix done() with Promises.

See comment: coder/code-server#2648 (comment)

Test plan

N/A (docs only)

[codecov-io]

Codecov Report

Merging #11077 (e7e396f) into master (42f78d4) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11077      +/-   ##
==========================================
- Coverage   64.22%   64.20%   -0.02%     
==========================================
  Files         305      305              
  Lines       13265    13265              
  Branches     3238     3238              
==========================================
- Hits         8519     8517       -2     
- Misses       4054     4055       +1     
- Partials      692      693       +1     

Impacted Files	Coverage Δ
packages/expect/src/utils.ts	94.83% <0.00%> (-1.30%)	⬇️

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[SimenB]

thanks! could you update the versioned docs as well?

[SimenB]

wonderful, thanks!

[jsjoeio]

@SimenB should be good now!

[github-actions]

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