fix docs and example

Author: Nicolasdejean

docs/TheThingsMessage.md

@@ -48,7 +48,7 @@ Encode the message you want to send.
 static void encodeDeviceData(devicedata_t *data, byte **buffer, size_t *size);
 ```
 
-- `devicedata_t *data`: Structure containing all the message we can send.
+- `devicedata_t *data`: Structure containing typical fields that devices send.
 - `byte **buffer`: Bytes to send.
 - `size_t *size`: The number of bytes to send.
 

examples/Message/Receive/Receive.ino

@@ -35,9 +35,6 @@ void setup()
 
   data.has_motion = true;
   data.has_water = true;
-  data.has_temperature_celcius = false;
-  data.has_temperature_fahrenheit = false;
-  data.has_humidity = false;
 }
 
 void loop() {