docs: hwmon: Add an index file and rename docs to *.rst

Now that all files were converted to ReST format, rename them
and add an index.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/amc6821 → Documentation/hwmon/amc6821.rst

@@ -106,4 +106,3 @@ different settings, you can set the following parameters:
 
 - init=1,
 - pwminv: 0 default pwm output, 1 inverts pwm output.
-

Documentation/hwmon/asb100 → Documentation/hwmon/asb100.rst

@@ -71,4 +71,3 @@ TODO:
   * Experiment with temp. sensor types.
   * Are there really 13 voltage inputs? Probably not...
   * Cleanups, no doubt...
-