Corrected sparse-color example.

Author: dlemstra

canvas/index.html

@@ -2982,8 +2982,7 @@ <h3>Sparse Color as a Fill Operator</h3>One of the original reasons for creating
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                         <pre class="bg-light text-dark mx-4"><samp>
-  magick sparse_source.gif txt:- |\
-    sed '1d; / 0) /d; s/:.* /,/;' |\
+  magick sparse_source.gif sparse-color:- |\
       magick sparse_source.gif -alpha off \
               -sparse-color shepards '@-' sparse_fill.png
 </samp></pre>