Update what-is-webrtc.md
Update what-is-webrtc.md
stephenlb/webrtc-sdk,arielgk/webrtc-sdk,arielgk/webrtc-sdk,stephenlb/webrtc-sdk,PrincessMelime/webtest.io,PrincessMelime/webtest.io,pubnub/webrtc,arielgk/webrtc-sdk,stephenlb/webrtc-sdk,pubnub/webrtc,PrincessMelime/webtest.io,pubnub/webrtc