Docs: Fix GSA typo

Author: nseidle

docs/menu_messages.md

@@ -23,15 +23,15 @@ Because of the large number of configurations possible, we provide a few common
 
 This will turn off all messages and enable the following messages:
 
-* NMEA-GGA, NMEA-SGA, NMEA-GST, NMEA-GSV, NMEA-RMC
+* NMEA-GGA, NMEA-GSA, NMEA-GST, NMEA-GSV, NMEA-RMC
 
 These five NMEA sentences are commonly used with SW Maps for general surveying.
 
 ## Reset to PPP Logging Defaults (NMEAx5 + RXMx2)
 
 This will turn off all messages and enable the following messages:
 
-* NMEA-GGA, NMEA-SGA, NMEA-GST, NMEA-GSV, NMEA-RMC, RXM-RAWX, RXM-SFRBX
+* NMEA-GGA, NMEA-GSA, NMEA-GST, NMEA-GSV, NMEA-RMC, RXM-RAWX, RXM-SFRBX
 
 These seven sentences are commonly used when logging and doing Precise Point Positioning (PPP) or Post Processed Kinematics (PPK). You can read more about PPP [here](https://learn.sparkfun.com/tutorials/how-to-build-a-diy-gnss-reference-station).