Fix typos in Documentation/: 'D'-'E'

This patch fixes typos in various Documentation txts. This patch addresses
some words starting with the letters 'D'-'E'.

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -1263,8 +1263,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 
     Note: on some notebooks the buffer address cannot be detected
     automatically, or causes hang-up during initialization.
-    In such a case, specify the buffer top address explicity via
-    buffer_top option.
+    In such a case, specify the buffer top address explicitly via
+    the buffer_top option.
     For example,
       Sony F250: buffer_top=0x25a800
       Sony F270: buffer_top=0x272800

Documentation/sound/alsa/Audiophile-Usb.txt

@@ -126,7 +126,7 @@ Here is a list of supported device_setup values for this device:
    - Alsa driver default mode
    - maintains backward compatibility with setups that do not use this 
      parameter by not introducing any change
-   - results sometimes in corrupted sound as decribed earlier
+   - results sometimes in corrupted sound as described earlier
  * device_setup=0x01
    - 16bits 48kHz mode with Di disabled
    - Ai,Ao,Do can be used at the same time

Documentation/sound/alsa/MIXART.txt

@@ -97,4 +97,4 @@ COPYRIGHT
 =========
 
 Copyright (c) 2003 Digigram SA <alsa@digigram.com>
-Distributalbe under GPL.
+Distributable under GPL.

Documentation/sound/alsa/Procfile.txt

@@ -71,7 +71,7 @@ The status of MIDI I/O is found in midi* files.  It shows the device
 name and the received/transmitted bytes through the MIDI device.
 
 When the card is equipped with AC97 codecs, there are codec97#*
-subdirectories (desribed later).
+subdirectories (described later).
 
 When the OSS mixer emulation is enabled (and the module is loaded),
 oss_mixer file appears here, too.  This shows the current mapping of