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/pnp.txt b/Documentation/pnp.txt
index 9529c9c..9ff966b 100644
--- a/Documentation/pnp.txt
+++ b/Documentation/pnp.txt
@@ -222,7 +222,7 @@
 	.remove		= serial_pnp_remove,
 };
 
-* name and id_table can not be NULL.
+* name and id_table cannot be NULL.
 
 4.) register the driver
 ex: