added a comment to mux2

dataflow_neuro/cell_lib_std.act

@@ -283,6 +283,8 @@ namespace tmpl {
     export defcell MUX2_X1(bool! y; bool? a, b, s, vdd, vss)
     {
       // y = !( S ? b : a )
+      // Actually looks more like
+      // if s = 0 -> use A
       // Adjusted to fit the XFAB Muxes
       bool _s;
       bool _y;