Harald Alvestrand d5f414cee1 Add class comments to Call and ChannelInterface
These class comments can help people to keep the relationship between
various classes / levels of abstraction straight.

Bug: None
Change-Id: I9fc899ac9c1080a406b06e88a38883cc3f00093d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/248169
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35769}
2022-01-24 11:30:28 +00:00
..
2020-10-02 12:33:34 +00:00
2021-11-22 08:44:15 +00:00
2021-05-29 07:37:33 +00:00