regulator: dt-bindings: qcom,usb-vbus-regulator: change node name

usb-vbus-regulator is a better generic node name than dcdc to change the
example to match.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20221229191542.123367-1-luca@z3ntu.xyzSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/qcom,usb-vbus-regulator.yaml

@@ -33,7 +33,7 @@ examples:
      pm8150b {
         #address-cells = <1>;
         #size-cells = <0>;
-        pm8150b_vbus: dcdc@1100 {
+        pm8150b_vbus: usb-vbus-regulator@1100 {
             compatible = "qcom,pm8150b-vbus-reg";
             reg = <0x1100>;
         };