Updated Rgb48Color object API (markdown)

Rgb48Color-object-API.md

@@ -142,4 +142,8 @@ This will blend between four colors by the amount defined by 2d weighting values
 The index operator allows accessing the R, G, and B properties using an index.  There are both read only and read write versions.
 ```
    uint16_t green = color[1];
+```
+You can also use the color index constants.  
+```
+   uint16_t green = color[ColorIndexG];
 ```