Fixed the comments to say where the actual Left-Hand Side and Right-Hand Side are put.

A description of positions [left, right] is appropriate more for C code than for Assembly code.  (A description of timing [first argument, second argument] is more appropriate for the way that Assembly code is written.)

libsrc/runtime/imul16x16r32.s

@@ -13,9 +13,9 @@
 ;---------------------------------------------------------------------------
 ; 16x16 => 32 signed multiplication routine.
 ;
-;   lhs         rhs           result          result also in
+;   LHS         RHS           result          result also in
 ; -------------------------------------------------------------
-;   ptr1        ax            ax:sreg
+;   ax          ptr1          ax:sreg
 ;
 ; There is probably a faster way to do this.
 ;