updated goto.py for better understanding

Changed print statement --> print("Fetching Absolute Height of Terrain....") to print("Fetching altitude amsl at home location....") so as to better reflect the reasons for fetching position() update.

Author: TheSharad

examples/goto.py

@@ -20,7 +20,7 @@ async def run():
             print("Global position estimate ok")
             break
 
-    print("Fetching Absolute Height of Terrain....")
+    print("Fetching altitude amsl at home location....")
     async for terrain_info in drone.telemetry.position():
         absolute_altitude = terrain_info.absolute_altitude_m
         break