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/networking/arcnet-hardware.txt b/Documentation/networking/arcnet-hardware.txt
index 30a5f01..731de41 100644
--- a/Documentation/networking/arcnet-hardware.txt
+++ b/Documentation/networking/arcnet-hardware.txt
@@ -139,7 +139,7 @@
 
 5. An active hub to passive hub.
 
-Remember, that you can not connect two passive hubs together.  The power loss
+Remember that you cannot connect two passive hubs together.  The power loss
 implied by such a connection is too high for the net to operate reliably.
 
 An example of a typical ARCnet network: