Documentation: add example
Documentation: add example

Summary:Add an example of a type declartion which will make flow complain when
a function is called with too many arguments.
Closes https://github.com/facebook/flow/pull/1490

Reviewed By: samwgoldman

Differential Revision: D3121191

Pulled By: gabelevi

fb-gh-sync-id: 326855e85f278d736ee41897e7d01702e703aaf9
fbshipit-source-id: 326855e85f278d736ee41897e7d01702e703aaf9

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