ACPICA: add ASF comment

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 515d82c..8494c42 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -97,6 +97,8 @@
  *
  * ASF - Alert Standard Format table (Signature "ASF!")
  *
+ * Conforms to the Alert Standard Format Specification V2.0, 23 April 2003
+ *
  ******************************************************************************/
 
 struct acpi_table_asf {