Improve RTPCodecParameters docs

[mickel8]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.60%. Comparing base (a7a7f29) to head (a6f80fd).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #178      +/-   ##
==========================================
- Coverage   87.85%   87.60%   -0.26%     
==========================================
  Files          47       47              
  Lines        2371     2371              
==========================================
- Hits         2083     2077       -6     
- Misses        288      294       +6     

Files with missing lines	Coverage Δ
lib/ex_webrtc/rtp_codec_parameters.ex	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

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