dt-bindings: iio: temperature: ltc2983: remove qutations from phandle ref

Not needed, so why have them?
Signed-off-by: Cosmin Tanislav <cosmin.tanislav@analog.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221103130041.2153295-5-demonsingur@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml

@@ -112,7 +112,7 @@ patternProperties:
         description:
           Phandle which points to a sensor object responsible for measuring
           the thermocouple cold junction temperature.
-        $ref: "/schemas/types.yaml#/definitions/phandle"
+        $ref: /schemas/types.yaml#/definitions/phandle
 
       adi,custom-thermocouple:
         description:
@@ -204,7 +204,7 @@ patternProperties:
       adi,rsense-handle:
         description:
           Phandle pointing to a rsense object associated with this RTD.
-        $ref: "/schemas/types.yaml#/definitions/phandle"
+        $ref: /schemas/types.yaml#/definitions/phandle
 
       adi,number-of-wires:
         description:
@@ -288,7 +288,7 @@ patternProperties:
         description:
           Phandle pointing to a rsense object associated with this
           thermistor.
-        $ref: "/schemas/types.yaml#/definitions/phandle"
+        $ref: /schemas/types.yaml#/definitions/phandle
 
       adi,single-ended:
         description: