Documentation: ACPI: i2c-muxes: fix I2C device references

Documentation: ACPI: i2c-muxes: fix I2C device references

When the device references were changed from relative to absolute in
commit e65cb011349e ("Documentation: ACPI: Fix parent device
references"), the MUX0 device was omitted from the paths.

So add it to fix the references.

Fixes: e65cb011349e ("Documentation: ACPI: Fix parent device references")
Closes: https://lore.kernel.org/all/48d0fb45-096c-4caa-b51c-753c2f17f018@gmail.com/
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20251027192628.130998-1-jonas.gorski@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>