webrtc-pc

82e105c9 - Clarification on RTX in Codec Capabilities/Parameters

Clarification on RTX in Codec Capabilities/Parameters Fix for Issue https://github.com/openpeer/ortc/issues/539 (filed against ORTC, but also applies to WebRTC 1.0). Rebase of PR https://github.com/w3c/webrtc-pc/pull/631