docs: hwmon: adm1177.rst: avoid using ReSt :doc:`foo` markup

The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/32b0db7e79a3ed0e817213113c607a1b819e3867.1622898327.git.mchehab+huawei@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/adm1177.rst

@@ -20,7 +20,8 @@ Usage Notes
 -----------
 
 This driver does not auto-detect devices. You will have to instantiate the
-devices explicitly. Please see :doc:`/i2c/instantiating-devices` for details.
+devices explicitly. Please see Documentation/i2c/instantiating-devices.rst
+for details.
 
 
 Sysfs entries