Add stream_large_files and host examples in static_file document
Add stream_large_files and host examples in static_file document

yunstanford/sanic,lixxu/sanic,yunstanford/sanic,yunstanford/sanic,ashleysommer/sanic,lixxu/sanic,channelcat/sanic,lixxu/sanic,channelcat/sanic,ashleysommer/sanic,yunstanford/sanic,channelcat/sanic,lixxu/sanic,ashleysommer/sanic,channelcat/sanic