dt-bindings: leds: common: fix example for gpio-leds

The preferred form for gpio-leds compatible subnodes is:
^led-[0-9a-f]$
Fix example by changing led0 and led1 to led-0 and led-1.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/leds/common.yaml

@@ -167,13 +167,13 @@ examples:
     led-controller {
         compatible = "gpio-leds";
 
-        led0 {
+        led-0 {
             function = LED_FUNCTION_STATUS;
             linux,default-trigger = "heartbeat";
             gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
         };
 
-        led1 {
+        led-1 {
             function = LED_FUNCTION_USB;
             gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
             trigger-sources = <&ohci_port1>, <&ehci_port1>;