Minor spelling fix.
Correct the terminology used in the value description? Both <http://gpsd.berlios.de/NMEA.html#_mwv_wind_speed_and_angle> and <http://www.tronico.fi/OH6NT/docs/NMEA0183.pdf> state that the "T" value means "True" not "Theoretical". It is assumed they don't disagree with the official, closed specification.
Minor typo fix.
Minor white space fix.
Merge pull request #4 from follower/minor-doc-fixes

Minor spelling fix