Changed explanation of which value should be greater for maximum efficiency.

doc/ref/mul.html

@@ -34,7 +34,7 @@
 			It is more efficient, however, to use <b>BOOST_PP_MUL_D</b> in such a situation.
 		</div>
 		<div>
-			This macro is the most efficient when <i>x</i> is less than or equal to <i>y</i>.&nbsp;
+			This macro is the most efficient when <i>x</i> is greater than or equal to <i>y</i>.&nbsp;
 			However, the efficiency gain is not worth actually comparing the two arguments prior to invocation.&nbsp;
 			In other words, <i>x</i> should be the value that is <i>most likely</i> to be the largest of the two operands.
 		</div>