Documentation: media: camera-sensor: Use link to upstream DT bindings

The Documentation/devicetree/bindings/clock/clock-bindings.txt file is
deprecated and points to clock-bindings.yaml, which is not hosted in the
kernel source tree. Use an HTTPS link to refer to the YAML binding
document.

While at it, drop "currently" from the paragraph, as the whole file
refers to the current recommended practices except where explicitly
noted.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Documentation/driver-api/media/camera-sensor.rst

@@ -32,10 +32,11 @@ can rely on this frequency being used.
 Devicetree
 ~~~~~~~~~~
 
-The currently preferred way to achieve this is using ``assigned-clocks``,
-``assigned-clock-parents`` and ``assigned-clock-rates`` properties. See
-``Documentation/devicetree/bindings/clock/clock-bindings.txt`` for more
-information. The driver then gets the frequency using ``clk_get_rate()``.
+The preferred way to achieve this is using ``assigned-clocks``,
+``assigned-clock-parents`` and ``assigned-clock-rates`` properties. See the
+`clock device tree bindings <https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/clock/clock.yaml>`_
+for more information. The driver then gets the frequency using
+``clk_get_rate()``.
 
 This approach has the drawback that there's no guarantee that the frequency
 hasn't been modified directly or indirectly by another driver, or supported by