Improve API and API docs

[mickel8]

No description provided.

[codecov]

Codecov Report

Merging #57 (b4f33e6) into master (528c056) will decrease coverage by 0.17%.
The diff coverage is 50.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   88.85%   88.68%   -0.17%     
==========================================
  Files          25       25              
  Lines        1059     1061       +2     
==========================================
  Hits          941      941              
- Misses        118      120       +2     

Files	Coverage Δ
lib/ex_webrtc/dtls_transport.ex	83.87% <ø> (ø)
lib/ex_webrtc/media_stream_track.ex	100.00% <ø> (ø)
lib/ex_webrtc/peer_connection/configuration.ex	89.85% <ø> (ø)
lib/ex_webrtc/rtp/opus_depayloader.ex	0.00% <ø> (ø)
lib/ex_webrtc/rtp/opus_payloader.ex	0.00% <ø> (ø)
lib/ex_webrtc/rtp/vp8_depayloader.ex	94.11% <ø> (ø)
lib/ex_webrtc/rtp/vp8_payload.ex	90.00% <ø> (ø)
lib/ex_webrtc/rtp/vp8_payloader.ex	100.00% <ø> (ø)
lib/ex_webrtc/rtp_codec_parameters.ex	100.00% <ø> (ø)
lib/ex_webrtc/rtp_sender.ex	100.00% <ø> (ø)
... and 3 more

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