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/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index f70e795..346cd3b 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -32,7 +32,7 @@
 	depends on PPC_PSERIES && DEBUG_FS
 	help
 	  Adds code to keep track of the number of hypervisor calls made and
-	  the amount of time spent in hypervisor callsr.  Wall time spent in
+	  the amount of time spent in hypervisor calls.  Wall time spent in
 	  each call is always calculated, and if available CPU cycles spent
 	  are also calculated.  A directory named hcall_inst is added at the
 	  root of the debugfs filesystem.  Within the hcall_inst directory