dt-bindings: mfd: qcom,spmi-pmic: Use generic ADC node name in examples

Update the examples to reflect a future requirement for the generic
`channel` node name on ADC channel nodes, while conveying the board name
of the channel in a label instead.
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230410202917.247666-5-marijn.suijten@somainline.org

Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.yaml

@@ -283,12 +283,12 @@ examples:
             #size-cells = <0>;
             #io-channel-cells = <1>;
 
-            adc-chan@6 {
+            channel@6 {
                 reg = <ADC5_DIE_TEMP>;
                 label = "die_temp";
             };
 
-            adc-chan@4f {
+            channel@4f {
                 reg = <ADC5_AMUX_THM3_100K_PU>;
                 qcom,ratiometric;
                 qcom,hw-settle-time = <200>;