Update/Fix RMC docs

[Turbo87]

There was a broken link in the doc comment for the RmcData struct and while I was at it I also added some other missing information in the comment :)

[codecov]

Codecov Report

Base: 76.80% // Head: 76.80% // No change to project coverage 👍

Coverage data is based on head (9970296) compared to base (a12f552).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   76.80%   76.80%           
=======================================
  Files          20       20           
  Lines         776      776           
=======================================
  Hits          596      596           
  Misses        180      180           

Impacted Files	Coverage Δ
src/sentences/rmc.rs	89.28% <ø> (ø)

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[elpiel]

Great catch and thank you for contributing to the project again!
I don't think we support all the options though... This is something you can improve on for this sentence.

If you're interested I've opened #60 issue for the additional parsing