ALSA: docs: fix dead hyperlink to Intel HD-Audio spec

Update the hyperlink as it currently redirects to a generic site
instead of the actual specification.

Signed-off-by: Hridesh MG <hridesh699@gmail.com>
Link: https://patch.msgid.link/20241120155553.21099-1-hridesh699@gmail.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>