Fix typos in /Documentation : 'U-Z'

This patch fixes typos in various Documentation txts. The patch addresses some
+words starting with the letters 'U-Z'.

Looks like I made it through the alphabet...just in time to start over again
+too!  Maybe I can fit more profound fixes into the next round...?  Time will
+tell. :)

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/input/atarikbd.txt b/Documentation/input/atarikbd.txt
index 1e7e585..1b00ad7 100644
--- a/Documentation/input/atarikbd.txt
+++ b/Documentation/input/atarikbd.txt
@@ -103,7 +103,7 @@
 
 5.1 Joystick Event Reporting
 
-In this mode, the ikbd generates a record whever the joystick position is
+In this mode, the ikbd generates a record whenever the joystick position is
 changed (i.e. for each opening or closing of a joystick switch or trigger).
 
 The joystick event record is two bytes of the form: