[IA64] spelling fixes: arch/ia64/

Spelling and apostrophe fixes in arch/ia64/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/kernel/perfmon_mckinley.h b/arch/ia64/kernel/perfmon_mckinley.h
index 9becccd..c4bec7a 100644
--- a/arch/ia64/kernel/perfmon_mckinley.h
+++ b/arch/ia64/kernel/perfmon_mckinley.h
@@ -181,7 +181,7 @@
 	.pmc_desc      = pfm_mck_pmc_desc,
 	.num_ibrs       = 8,
 	.num_dbrs       = 8,
-	.use_rr_dbregs = 1 /* debug register are use for range retrictions */
+	.use_rr_dbregs = 1 /* debug register are use for range restrictions */
 };