Documentation: devicetree: Fix s2mps11 example syntax

It's <1>, not 1.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Sachin Kamat <sachin.kamat@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

Documentation/devicetree/bindings/mfd/s2mps11.txt

@@ -96,7 +96,7 @@ Example:
 
 		s2m_osc: clocks {
 			compatible = "samsung,s2mps11-clk";
-			#clock-cells = 1;
+			#clock-cells = <1>;
 			clock-output-names = "xx", "yy", "zz";
 		};