spelling fixes: arch/sh/

Spelling fixes in arch/sh/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/drivers/pci/pci-st40.h b/arch/sh/drivers/pci/pci-st40.h
index d729e0c..cf0d35b 100644
--- a/arch/sh/drivers/pci/pci-st40.h
+++ b/arch/sh/drivers/pci/pci-st40.h
@@ -4,7 +4,7 @@
  * May be copied or modified under the terms of the GNU General Public
  * License.  See linux/COPYING for more information.                            
  *
- * Defintions for the ST40 PCI hardware.
+ * Definitions for the ST40 PCI hardware.
  */
 
 #ifndef __PCI_ST40_H__