[ALSA] oxygen: update ALSA-Configuration.txt

Add documentation entries for snd-oxygen and snd-virtuoso.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -1559,6 +1559,23 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 
     This module supports only one card, autoprobe and PnP.
 
+  Module snd-oxygen
+  -----------------
+
+    Module for sound cards based on the C-Media CMI8788 chip:
+    * Asound A-8788
+    * AuzenTech X-Meridian
+    * Bgears b-Enspirer
+    * Club3D Theatron DTS
+    * HT-Omega Claro
+    * Razer Barracuda AC-1
+    * Sondigo Inferno
+    * TempoTec HIFIER
+
+    This module supports autoprobe and multiple cards.
+
+    Power management is _not_ supported.
+
   Module snd-pcxhr
   ----------------
 
@@ -1997,6 +2014,16 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
     
     This module supports multiple cards.
 
+  Module snd-virtuoso
+  -------------------
+
+    Module for sound cards based on the Asus AV200 chip, i.e.,
+    Xonar D2 and Xonar D2X.
+
+    This module supports autoprobe and multiple cards.
+
+    Power management is _not_ supported.
+
   Module snd-vx222
   ----------------