Fix trivial typos in Kconfig* files

Fix several typos in help text in Kconfig* files.

Signed-off-by: David Sterba <dave@jikos.cz>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index ea6211c..a567dae 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -197,7 +197,7 @@
 
 	  Please note that not all PPTP modes of operation are supported yet.
 	  Specifically these limitations exist:
-	    - Blindy assumes that control connections are always established
+	    - Blindly assumes that control connections are always established
 	      in PNS->PAC direction. This is a violation of RFC2637.
 	    - Only supports a single call within each session