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>

Documentation/networking/cs89x0.txt

@@ -584,7 +584,7 @@ of four ways after installing and or configuring the CS8900/20-based adapter:
 
     1.) The system does not boot properly (or at all).
 
-    2.) The driver can not communicate with the adapter, reporting an "Adapter
+    2.) The driver cannot communicate with the adapter, reporting an "Adapter
         not found" error message.
 
     3.) You cannot connect to the network or the driver will not load.