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[bot]]

Codecov Report

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

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

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #57 +/- ## ======================================= Coverage 76.80% 76.80% ======================================= Files 20 20 Lines 776 776 ======================================= Hits 596 596 Misses 180 180 ``` | [Impacted Files](https://codecov.io/gh/AeroRust/nmea/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust) | Coverage Δ | | |---|---|---| | [src/sentences/rmc.rs](https://codecov.io/gh/AeroRust/nmea/pull/57/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust#diff-c3JjL3NlbnRlbmNlcy9ybWMucnM=) | `89.28% <ø> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust)

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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