[ARM] spelling fixes

Spelling fixes in arch/arm/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/plat-omap/usb.c b/arch/arm/plat-omap/usb.c
index 25489aa..a5aedf9 100644
--- a/arch/arm/plat-omap/usb.c
+++ b/arch/arm/plat-omap/usb.c
@@ -177,7 +177,7 @@
 
 	/* NOTE:  SPEED and SUSP aren't configured here.  OTG hosts
 	 * may be able to use I2C requests to set those bits along
-	 * with VBUS switching and overcurrent detction.
+	 * with VBUS switching and overcurrent detection.
 	 */
 
 	if (cpu_class_is_omap1() && nwires != 6)