treewide: Kconfig: fix wording / spelling

This patch fix spelling typos in Kconfig.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 81f57e8..7d5d9fd 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -158,7 +158,7 @@
 	  the CPU core definition and currently needs to be selected manually.
 
 	  Multiprocessor support in implemented with external cache and
-	  interrupt controlers.
+	  interrupt controllers.
 
 	  The MX interrupt distributer adds Interprocessor Interrupts
 	  and causes the IRQ numbers to be increased by 4 for devices