ALSA: hda - Update documetation for hints sysfs entry

  to this file.

init_verbs::

  The extra verbs to execute at initialization.  You can add a verb by

  writing to this file.  Pass three numbers: nid, verb and parameter.

  writing to this file.  Pass three numbers: nid, verb and parameter

  (separated with a space).

hints::

  Shows hint strings for codec parsers for any use.  Right now it's

  not used.

  Shows / stores hint strings for codec parsers for any use.

  Its format is `key = value`.  For example, passing `hp_detect = yes`

  to IDT/STAC codec parser will result in the disablement of the

  headphone detection.

init_pin_configs::

  Shows the initial pin default config values set by BIOS.

driver_pin_configs::