dt-bindings: iio: chemical: add Atlas EZO Humidity module documentation

Cc: devicetree@vger.kernel.org
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/chemical/atlas,sensor.yaml

@@ -20,6 +20,7 @@ description: |
     http://www.atlas-scientific.com/_files/_datasheets/_oem/RTD_oem_datasheet.pdf
     http://www.atlas-scientific.com/_files/_datasheets/_probe/EZO_CO2_Datasheet.pdf
     https://www.atlas-scientific.com/files/EZO_O2_datasheet.pdf
+    https://www.atlas-scientific.com/files/EZO_HUM_Datasheet.pdf
 
 properties:
   compatible:
@@ -31,6 +32,7 @@ properties:
       - atlas,rtd-sm
       - atlas,co2-ezo
       - atlas,o2-ezo
+      - atlas,hum-ezo
 
   reg:
     maxItems: 1