hwmon: (ina2) update ti,ina2xx.yaml reference in documentation

Changeset 94f1ab94 ("dt-bindings: hwmon: convert TI INA2xx bindings to dt-schema")
renamed: Documentation/devicetree/bindings/hwmon/ina2xx.txt
to: Documentation/devicetree/bindings/hwmon/ti,ina2xx.yaml.

Update its cross-reference accordingly.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/886bd248721b146d844d46e26ddd4cd277f51446.1610535350.git.mchehab+huawei@kernel.org


Signed-off-by: Guenter Roeck <linux@roeck-us.net>