Re: [streams] Fill the internal slots section of ReadableByteStreamController (#417)

> +Instances of <code>ReadableByteStreamController</code> are created with the internal slots described in the following table:
> +
> +<table>
> +  <thead>
> +    <tr>
> +      <th>Internal Slot</th>
> +      <th>Description (<em>non-normative</em>)</th>
> +    </tr>
> +  </thead>
> +  <tr>
> +    <td>\[[controlledReadableByteStream]]
> +    <td>The <a href="#rbs-class"><code>ReadableByteStream</code></a> instance controlled
> +  </tr>
> +  <tr>
> +    <td>\[[underlyingByteSource]]
> +    <td>An object representation of the stream's underlying byte source

underlying byte source needs `<a>` wrappers here and elsewhere

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