Documentation: iio: Extend documentation for hmc5843 bindings.

Signed-off-by: NMarek Belisko <marek@goldelico.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Documentation/devicetree/bindings/iio/magnetometer/hmc5843.txt

@@ -3,6 +3,9 @@
 Required properties:
 
   - compatible : should be "honeywell,hmc5843"
+  Other models which are supported with driver are:
+	"honeywell,hmc5883"
+	"honeywell,hmc5883l"
   - reg : the I2C address of the magnetometer - typically 0x1e
 
 Optional properties: