docs: add info about serializable types for `querystring.stringify()`#12313

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shubheksha wants to merge 3 commits intonodejs:masterfrom

shubheksha:docs-querystring-serializable-data-types

Commits on Apr 10, 2017

Commits on Apr 11, 2017

doc: uses {} to link to mdn docs for types
shubheksha
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