Tweaking to rankingdocs 2, a=chris

diff --git a/en-US/pages/ranking.thtml b/en-US/pages/ranking.thtml
index c09f2fd..5e27b14 100644
--- a/en-US/pages/ranking.thtml
+++ b/en-US/pages/ranking.thtml
@@ -853,7 +853,9 @@ with the following equations:
 \mbox{DR}(q, [u]) &=& \sum_{i\in[u]}\mbox{DR}(i)\cdot \mbox{wt}(\mbox{type}(i)).
 \end{eqnarray}
 </p>
-<pThis completes our description of the Yioop scoring mechanism
+<p>In the above, median's and average's are taken only over the non-zero
+elements of the respective sets.
+This completes our description of the Yioop scoring mechanism
 in the conjunctive query case. </p>

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