Update src/devices/Ahtxx/AhtBase.cs

Co-authored-by: NKrzysztof Wicher <mordotymoja@gmail.com>

src/devices/Ahtxx/AhtBase.cs

@@ -74,7 +74,7 @@ namespace Iot.Device.Ahtxx
         /// Gets the current relative humidity reading from the sensor.
         /// Reading the humidity takes between 10 ms and 80 ms.
         /// </summary>
-        /// <returns>Temperature reading</returns>
+        /// <returns>Relative humidity reading</returns>
         public Ratio GetHumidity()
         {
             Measure();