[exponent-docs] Update documentation to match module functionality
[exponent-docs] Update documentation to match module functionality

I just spend 20 minutes trying to work out why the app was failing on my device when I was following the docs only to realise the docs didn'\''t match the module: https://github.com/exponentjs/exponent-sdk/blob/6a07b8be5a3ab1eb9ca048284ae0520d7649e4e6/src/Components/Video.js#L144

Closes #12

exponentjs/exponent,exponentjs/exponent,exponent/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponent/exponent,exponent/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponentjs/exponent