Re: [fetch] Add "Streams" section. (#119)

>  
> +<h4>ReadableStream</h4>
> +<p>A <dfn title=concept-readable-stream>ReadableStream</dfn> represents a stream of data as
> +specified in <span data-anolis-ref>STREAMS</span>. In this section, we define common operations

Say `<cite>Streams</cite>` here, add the reference at the end of the paragraph.

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