[ALSA] Remove multi-card support for ali5451 and nm256

Modules: Documentation,ALI5451 driver,NM256 driver

Removed multi-card supports for ali5451 and nm256 drivers.
They are supposed to be a single device.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 9342846..2f27f39 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -167,7 +167,7 @@
     spdif           - Support SPDIF I/O
     		    - Default: disabled
 
-    Module supports autoprobe and multiple chips (max 8).
+    This module supports one chip and autoprobe.
 
     The power-management is supported.
 
@@ -957,7 +957,7 @@
     reset_workaround2 - enable extended AC97 RESET workaround for some
 		      other laptops
 
-    Module supports autoprobe and multiple chips (max 8).
+    This module supports one chip and autoprobe.
 
     The power-management is supported.