AP_GPS: move explanation of ublox rates into ublox header

libraries/AP_GPS/AP_GPS.cpp

@@ -753,13 +753,6 @@ AP_GPS_Backend *AP_GPS::_detect_instance(uint8_t instance)
 
     while (bytecount-- > 0) {
         uint8_t data = _port[instance]->read();
-        /*
-          running a uBlox at less than 38400 will lead to packet
-          corruption, as we can't receive the packets in the 200ms
-          window for 5Hz fixes. The NMEA startup message should force
-          the uBlox into 230400 no matter what rate it is configured
-          for.
-        */
 
 #if AP_GPS_UBLOX_ENABLED
         if ((_type[instance] == GPS_TYPE_AUTO ||

libraries/AP_GPS/AP_GPS_UBLOX.h

@@ -38,6 +38,12 @@
  * The reason we need the NAV_SOL rate message at all is some uBlox
  * modules are configured with all ubx binary messages off, which
  * would mean we would never detect it.
+
+ * running a uBlox at less than 38400 will lead to packet
+ * corruption, as we can't receive the packets in the 200ms
+ * window for 5Hz fixes. The NMEA startup message should force
+ * the uBlox into 230400 no matter what rate it is configured
+ * for.
  */
 #define UBLOX_SET_BINARY_115200 "\265\142\006\001\003\000\001\006\001\022\117$PUBX,41,1,0023,0001,115200,0*1C\r\n"