removed HDOP from Nominal documentation as its is missing from GPSFix…

[gregcope]

…_cfg.h

Hi,

I think there may be a documentation or config error.

The documentation suggests the nominal config reports HDOP, yet it is commented out in the GPSfix_cfg.h

//#define GPS_FIX_HDOP See; https://github.com/SlashDevin/NeoGPS/blob/master/extras/configs/Nominal/GPSfix_cfg.h#L27

This pull request corrects the documentation - an alternative is to uncomment that line, as the correct sentences #define NMEAGPS_PARSE_GGA are configured in;

https://github.com/SlashDevin/NeoGPS/blob/master/extras/configs/Nominal/NMEAGPS_cfg.h#L14