JSON: Correcting the Sensor Class field

Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>

src/max31723/max31723.json

@@ -3,7 +3,7 @@
     "Description": "API for the MAX31723 Temperature Sensor",
     "Sensor Class":
     {
-        "max31723":
+        "MAX31723":
         {
             "Name": "SPI/3-wire Digital Thermometer",
             "Description": "Maxim Integrated* [MAX31723](http://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf) is a low-voltage 3-wire/SPI temperature sensor controller. This module was tested on the Maxim Integrated [MAX31732PMB1 PMOD module](http://datasheets.maximintegrated.com/en/ds/MAX31723PMB1.pdf) from the analog PMOD kit.",
@@ -36,4 +36,4 @@
             }
         }
     }
-}
+}