Fixed the additive algorithm to actually decrement the value.

Author: tabatkins

css3-lists/Overview.src.html

@@ -1220,6 +1220,10 @@ <h4>
 		<li>Append the <i>current tuple</i>'s <i>counter glyph</i> to <var>S</var> 
 		<code>floor( <var>value</var> / <var><i>current tuple</i>'s weight</var> )</code>
 		times (this may be 0).</li>
+
+		<li>Decrement <var>value</var> by the <var><i>current tuple</i>'s weight multiplied
+		by the number of times the <i>current tuple</i> was appended to <var>S</var>
+		in the previous step.</li>
 	</ol>
 
 	<p>If the loop ended because <var>value</var> is 0, return S.  Otherwise, the