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
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