Section 1: ICE Transport Controller not in Big Picture

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The "Big Picture" leaves out the ICE Transport Controller. Should we add that?

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Here is a potential "Big Picture" that adds the ICE Transport Controller as well as fixing the "Caps" and "Parameter" issues in the DTLS Transport object (as filed by Shijun Sun).

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The above figure might confuse the reader into thinking that there are multiple RTCIceTransportController objects controlling a single RTCIceTransport. Adding multiple RTCIceTransports would also be confusing because then the reader might think that a single RTCDtlsTransport object uses multiple RTCIceTransports. So the recommendation is to only have a single RTCIceTransportController object on the figure, as given below.