Update query transformation feature doc

Refer to prefix_with function from SQLAlchemy Expressions API as similar technique.
SOCI · Mar 4, 2013 · aab394b · aab394b
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diff --git a/doc/queries.html b/doc/queries.html
@@ -125,6 +125,10 @@ <h3>Query transformation</h3>
     statements (i.e. <code>SELECT /*+RULE*/ A FROM C</code> in Oracle 9)</li>
 </ul>
 
+<p>Query transformation mechanism can also be considered for similar uses as
+<code>prefix_with</code> function from 
+<a href="http://docs.sqlalchemy.org/en/latest/core/expression_api.html">SQLAlchemy Expressions API</a>.</p>
+
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