graphics module intro changed

Amelia,

I made the change to the Graphics Module Introduction. I ended up putting
the change in the goal list above the paragraph as it it is a goal and felt
out of place in the paragraph below.  Tweak if you wish and happy editing.

                                                              
     Regards,                                                 
                                                              
    Fred Esch                                                 
 Watson, IBM, W3C                                             
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