Structure for Examples Section

The SDP is all wrong in this but here is the structure I am proposing for the Examples section. This does not remove the appendix but I'd propose we remove the whole appendix if we add this. Let me know if this looks reasonable as the outline and if so we can sort out the details of the flows and fix the SDP. The current flows and SDP are based off the XMPP flow in the appendix. 
So should this look like 

//                  data channel opens  
BobUA->BobJS:       onopen 
AliceUA->AliceJS:   onopen  
BobUA->BobJS:       ondatachannel callback 
AliceUA->AliceJS:   ondatachannel callback  

Be interesting to see SDP was not clear to me if we were setting up one or two but lets go with two