Fix some typos in Documentation/: 'A'

This patch fixes typos in various Documentation txts.
This patch addresses some words starting with the letter 'A'.

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/networking/3c509.txt b/Documentation/networking/3c509.txt
index 867a99f..0643e3b 100644
--- a/Documentation/networking/3c509.txt
+++ b/Documentation/networking/3c509.txt
@@ -126,7 +126,7 @@
 or impossible in normal operation. Possible causes of this error report are:
  
    - a "green" mode enabled that slows the processor down when there is no
-     keyboard activitiy. 
+     keyboard activity. 
 
    - some other device or device driver hogging the bus or disabling interrupts.
      Check /proc/interrupts for excessive interrupt counts. The timer tick