ALSA: docs: Add documents for recently changes in snd-usb-audio

Changed:
  - ignore_ctl_error
  - lowlatency
  - skip_validation
  - quirk_flags[19:24]

[ corrected a typo -- tiwai ]

Signed-off-by: Cryolitia PukNgae <cryolitia@uniontech.com>
Link: https://patch.msgid.link/20250829-sound-doc-v1-1-e0110452b03d@uniontech.com


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