ALSA: hda-intel - remove model=hwio from documentation

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

Documentation/sound/alsa/HD-Audio.txt

@@ -196,12 +196,6 @@ generic parser regardless of the codec.  Usually the codec-specific
 parser is much better than the generic parser (as now).  Thus this
 option is more about the debugging purpose.
 
-Another special meaning has 'model=hwio'. For this model, the driver
-bypasses any codec initialization and the reset procedure for codecs
-is also bypassed. This mode is usefull to enable direct access using
-hwdep interface (using hdaverb or hda-analyzer tools) and retain
-codec setup from BIOS.
-
 Speaker and Headphone Output
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 One of the most frequent (and obvious) bugs with HD-audio is the