Fix "can not" in Documentation and Kconfig

Randy brought it to my attention that in proper english "can not" should always
be written "cannot". I donot see any reason to argue, even if I mightnot
understand why this rule exists.  This patch fixes "can not" in several
Documentation files as well as three Kconfigs.

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/video4linux/et61x251.txt b/Documentation/video4linux/et61x251.txt
index b65aa0f..1bdee8f 100644
--- a/Documentation/video4linux/et61x251.txt
+++ b/Documentation/video4linux/et61x251.txt
@@ -222,7 +222,7 @@
 	[root@localhost #] echo 1 > i2c_reg
 	[root@localhost #] cat i2c_val
 
-Note that if the sensor registers can not be read, "cat" will fail.
+Note that if the sensor registers cannot be read, "cat" will fail.
 To avoid race conditions, all the I/O accesses to the files are serialized.