doc: add more detailed illustration for `module.exports` and `exports`.#9552

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iamchenxin wants to merge 2 commits intonodejs:masterfrom

iamchenxin:mexports

Commits on Nov 11, 2016

doc: add more detailed illustration for `module.exports` and `exports`.
iamchenxin
committed

Commits on Nov 13, 2016

fix some style, grammar, formatting, error.
iamchenxin
committed