[webrtc-pc] Typo in last paragraph of 5 item (#2632)

Pareder has just created a new issue for https://github.com/w3c/webrtc-pc:

== Typo in last paragraph of 5 item ==
In the last paragraph of 5 item (https://github.com/w3c/webrtc-pc/blob/main/webrtc.html#L7508) there is:
> When creating an answer, only **media media** descriptions ...
I think that double **media** is a misspelling.

Please view or discuss this issue at https://github.com/w3c/webrtc-pc/issues/2632 using your GitHub account


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