arch: Fix spelling

Change-Id: Ifea10f0180c0c4b684030a168402a95fadf1a9db
Signed-off-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-on: http://review.coreboot.org/3727
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/arch/x86/boot/tables.c

@@ -66,7 +66,7 @@ struct lb_memory *write_tables(void)
 	rom_table_end =   0xf0000;
 
 	/* Start low addr at 0x500, so we don't run into conflicts with the BDA
-	 * in case our data structures grow beyound 0x400. Only multiboot, GDT
+	 * in case our data structures grow beyond 0x400. Only multiboot, GDT
 	 * and the coreboot table use low_tables.
 	 */
 	low_table_start = 0;