Jason Yung bff8e37049 Clarify ReactDOM.render usage (#34682) ...

* Clarify ReactDOM.render usage

demo code misleads campers into thinking that the second arg for ReactDOM.render is a string

* Update index.md

2019-02-08 07:53:38 -08:00

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index.md

Clarify ReactDOM.render usage (#34682)

2019-02-08 07:53:38 -08:00