webrtc-pc

8938421c - Adding note about the relationship between tracks of senders/receivers. (#1911)

Adding note about the relationship between tracks of senders/receivers. (#1911) * Adding note about the relationship between tracks of senders/receivers. Fixes #1169. Clarifies that there's not a 1:1 relationship between tracks sent by one PeerConnection and received by the other (due to `replaceTrack`), and the IDs are not guaranteed to match. So it's better to think of a 1:1 relationship between senders on one side and receivers on the other side, rather than tracks.