[IA64] setup.c Typo fix "Architechtuallly"

s/Architechtuallly/Architecturally/
Signed-off-by: NJustin P. Mattock <justinmattock@gmail.com>
Signed-off-by: NTony Luck <tony.luck@intel.com>

arch/ia64/sn/kernel/setup.c

@@ -592,7 +592,7 @@ void __cpuinit sn_cpu_init(void)
 	/*
 	 * Don't check status. The SAL call is not supported on all PROMs
 	 * but a failure is harmless.
-	 * Architechtuallly, cpu_init is always called twice on cpu 0. We
+	 * Architecturally, cpu_init is always called twice on cpu 0. We
 	 * should set cpu_number on cpu 0 once.
 	 */
 	if (cpuid == 0) {