doc: improve AsyncLocalStorage introduction#36946

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brillout wants to merge 6 commits intonodejs:masterfrom brillout:patch-2

+5

Commits on Jan 15, 2021

Commits on Jan 18, 2021

Commits on Jan 19, 2021

[review] implement @puzpuzpuz 's feedback
brillout
committed

Commits on Jan 22, 2021

[review] emphasis significance of performance
brillout
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