fixing typo

Author: howcome

css-multicol/Overview.src.html

@@ -816,7 +816,7 @@ <h3>Pseudo-algorithm</h3>
 <p>In paged media, user agents may perform this calculation on a
 per-page basis.
 
-<p>The used value for for 'column-count' is calculated without
+<p>The used value for 'column-count' is calculated without
 regard for explicit column breaks or constrained column lengths,
 while the actual value takes these into consideration.