spelling fixes: arch/alpha/

Spelling fixes in arch/alpha/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/arch/alpha/kernel/sys_sio.c b/arch/alpha/kernel/sys_sio.c
index 14b5a75..ee7b900 100644
--- a/arch/alpha/kernel/sys_sio.c
+++ b/arch/alpha/kernel/sys_sio.c
@@ -78,7 +78,7 @@
  * example, sound boards seem to like using IRQ 9.
  *
  * This is NOT how we should do it. PIRQ0-X should have
- * their own IRQ's, the way intel uses the IO-APIC irq's.
+ * their own IRQs, the way intel uses the IO-APIC IRQs.
  */
 
 static void __init