regulator: max8973: fix a typo in documentation

Fix a s/maxium/maxim/ typo in DT binding documentation.
Reported-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

Documentation/devicetree/bindings/regulator/max8973-regulator.txt

@@ -2,7 +2,7 @@
 
 Required properties:
 
-- compatible:	must be "maxium,max8973"
+- compatible:	must be "maxim,max8973"
 - reg:		the i2c slave address of the regulator. It should be 0x1b.
 
 Any standard regulator properties can be used to configure the single max8973
@@ -11,7 +11,7 @@ DCDC.
 Example:
 
 	max8973@1b {
-		compatible = "maxium,max8973";
+		compatible = "maxim,max8973";
 		reg = <0x1b>;
 
 		regulator-min-microvolt = <935000>;