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/ioctl/hdio.txt b/Documentation/ioctl/hdio.txt
index 11c9be4..c19efde 100644
--- a/Documentation/ioctl/hdio.txt
+++ b/Documentation/ioctl/hdio.txt
@@ -203,7 +203,7 @@
 
 	  Source code comments read:
 
-	    This is tightly woven into the driver->do_special can not
+	    This is tightly woven into the driver->do_special cannot
 	    touch.  DON'T do it again until a total personality rewrite
 	    is committed.