docs: i2c: old-module-parameters: fix internal hyperlink

Use ReST syntax so that a proper hyperlink is generated.
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Documentation/i2c/old-module-parameters.rst

@@ -12,8 +12,8 @@ address), "force" (to forcibly attach the driver to a given device) and
 With the conversion of the I2C subsystem to the standard device driver
 binding model, it became clear that these per-module parameters were no
 longer needed, and that a centralized implementation was possible. The new,
-sysfs-based interface is described in the documentation file
-"instantiating-devices", section "Method 4: Instantiate from user-space".
+sysfs-based interface is described in :doc:`instantiating-devices`, section
+"Method 4: Instantiate from user-space".
 
 Below is a mapping from the old module parameters to the new interface.