dt-bindings: watchdog: faraday: Fix typo in example 'timeout-sec' property

The 'unevaluatedProperties' schema checks is not fully working and doesn't
catch some cases where there's a $ref to another schema. A fix is pending,
but results in new warnings in examples.

The correct common watchdog property is 'timeout-sec', not 'timeout-secs'.
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220526014127.2872254-1-robh@kernel.org

Documentation/devicetree/bindings/watchdog/faraday,ftwdt010.yaml

@@ -55,7 +55,7 @@ examples:
       compatible = "faraday,ftwdt010";
       reg = <0x41000000 0x1000>;
       interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
-      timeout-secs = <5>;
+      timeout-sec = <5>;
     };
   - |
     watchdog: watchdog@98500000 {