dt-bindings: iio: dac: Fix AD5686 references

The example and filename use 'adi,ad5686', but the schema doesn't
document it. The AD5686 is also a SPI interface variant while all the
documented variants have an I2C interface. So let's update all the
references to AD5686 to AD5696.

Cc: Lars-Peter Clausen <[e-mail]>
Cc: Michael Hennerich <[e-mail]>
Cc: Jonathan Cameron <[e-mail]>
Cc: Peter Meerwald-Stadler <[e-mail]>
Cc: Michael Auchter <[e-mail]>
Cc: [e-mail]
Signed-off-by: Rob Herring <[e-mail]>
Acked-by: Lars-Peter Clausen <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/iio/dac/adi,ad5686.yaml Documentation/devicetree/bindings/iio/dac/adi,ad5696.yaml

···
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/iio/dac/adi,ad5686.yaml#
+$id: http://devicetree.org/schemas/iio/dac/adi,ad5696.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Analog Devices AD5686 and similar multi-channel DACs
+title: Analog Devices AD5696 and similar multi-channel DACs
 
 maintainers:
   - Michael Auchter <[e-mail]>
 
 description: |
-  Binding for Analog Devices AD5686 and similar multi-channel DACs
+  Binding for Analog Devices AD5696 and similar multi-channel DACs
 
 properties:
   compatible:
···
       #address-cells = <1>;
       #size-cells = <0>;
 
-      ad5686: dac@0 {
-        compatible = "adi,ad5686";
+      ad5696: dac@0 {
+        compatible = "adi,ad5696";
         reg = <0>;
         vcc-supply = <&dac_vref>;
       };