dt-bindings: pps: gpio: Correct indentation and style in DTS example

DTS example in the bindings should be indented with 2- or 4-spaces and
aligned with opening '- |', so correct any differences like 3-spaces or
mixtures 2- and 4-spaces in one binding.

No functional changes here, but saves some comments during reviews of
new patches built on existing code.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Acked-by: Rodolfo Giometti <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring (Arm) <[e-mail]>

Documentation/devicetree/bindings/pps/pps-gpio.yaml

···
 
 examples:
   - |
-      #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/gpio/gpio.h>
 
-      pps {
-          compatible = "pps-gpio";
-          pinctrl-names = "default";
-          pinctrl-0 = <&pinctrl_pps>;
-          gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;
-          assert-falling-edge;
-          echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;
-          echo-active-ms = <100>;
-      };
+    pps {
+        compatible = "pps-gpio";
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_pps>;
+        gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;
+        assert-falling-edge;
+        echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;
+        echo-active-ms = <100>;
+    };