Update builtins.doc.js
Update builtins.doc.js

Summary:
Fix typos
Closes https://github.com/facebook/flow/pull/1723

Differential Revision: D3234794

Pulled By: mroch

fb-gh-sync-id: 326de2f35d25b1a4300c9e85811fb6fc200dc444
fbshipit-source-id: 326de2f35d25b1a4300c9e85811fb6fc200dc444

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