Update mul_MEM_FAC1

src/basic/math/ba28.mul_MEM_FAC1.s

@@ -3,15 +3,17 @@
 ;; #LAYOUT# *   BASIC_0 #TAKE
 ;; #LAYOUT# *   *       #IGNORE
 
-;
+; This file is under the MIT license, it contains code released by Microsoft Corporation.
+; See LICENSE for more information.
+
 ; Math package - multiplies FAC1 by RAM
 ;
+; This is verified to be identical to the original Microsoft implementation where it was named FMULT
+;
 ; Input:
 ; - .A - address low byte
 ; - .Y - address high byte
 ;
-; Note:
-; - C64 Wiki calls it FMULT, this looks like a mistake
 ;
 ; See also:
 ; - [CM64] Computes Mapping the Commodore 64 - page 113