dt-bindings: Misc fix for the ATH79 MISC interrupt controllers

Add a missing quote in the example
Signed-off-by: Alban Bedel <albeu@free.fr>
CC: trivial@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/qca,ath79-misc-intc.txt

@@ -22,7 +22,7 @@ Interrupt Controllers bindings used by client devices.
 Example:
 
 	interrupt-controller@18060010 {
-		compatible = "qca,ar9132-misc-intc", qca,ar7100-misc-intc";
+		compatible = "qca,ar9132-misc-intc", "qca,ar7100-misc-intc";
 		reg = <0x18060010 0x4>;
 
 		interrupt-parent = <&cpuintc>;