fix documentation currentweather and weatherforecast function

roundValue:

This function toFixed return a string type not a number value.

modules/default/weatherforecast/weatherforecast.js

@@ -356,7 +356,7 @@ Module.register("weatherforecast",{
 	 *
 	 * argument temperature number - Temperature.
 	 *
-	 * return number - Rounded Temperature.
+	 * return string - Rounded Temperature.
 	 */
 	roundValue: function(temperature) {
 		var decimals = this.config.roundTemp ? 0 : 1;