Removed obsolete functions from the reference.

[SVN r13474]

doc/reference/comparison_less.htm

@@ -51,10 +51,6 @@ in the range [0, <a href="limits.htm#BOOST_PP_LIMIT_MAG">BOOST_PP_LIMIT_MAG</a>]
  <p>Can be used inside <a href="while.htm#BOOST_PP_WHILE">BOOST_PP_WHILE</a>().</p> 
 <hr>
 
-<h2><a name="BOOST_PREPROCESSOR_LESS">#define BOOST_PREPROCESSOR_LESS</a>(X,Y)</h2>
- <p>Obsolete. Use <a href="comparison_less.htm#BOOST_PP_LESS">BOOST_PP_LESS</a>().</p> 
-<hr>
-
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