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>

init/Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index d0edf42..f342700 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -308,7 +308,7 @@
 	  releases.
 
 	  If enabled, this option will also move any device structures
-	  that belong to a class, back into the /sys/class heirachy, in
+	  that belong to a class, back into the /sys/class hierarchy, in
 	  order to support older versions of udev.
 
 	  If you are using a distro that was released in 2006 or later,