Clarify example on example with media before signaling

[dontcallmedom]

As per discussion in #1708:

• Change the title to 'with incoming media before signaling'
• Change the intro to add 'This code shows the receiving side'
• Remove the 'selfView' code

close #1708

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Preview | Diff

[aboba]

By removing the call to getUserMedia, where will stream come from?

[dontcallmedom]

stream is no longer used in the example, so it doesn't need to come from anywhere as far as I can tell; I have reverted my removal of the insertion of the remoteView though.

[fippo]

You're a bit meta by clarifying the example on the example, no? :-)

The example remains wrong though, see also #1709:

remoteView.srcObject = new MediaStream(pc.getReceivers().map((r) => r.track));

is called in start() which is immediately after the peerconnection creation. Since there are no calls to addTransceiver, pc.getReceivers() will return [] and the result is not useful.

I still think removing it (as proposed in #1926) is easier than coming up with something that is not confusing. Maybe @jan-ivar can be convinced to write a blog post instead?

[dontcallmedom]

ok, I'll close this PR then and wait to see how #1926 gets resolved then :)