Removed obsolete functions from the reference.

[SVN r13474]

doc/reference/cat.htm

@@ -44,10 +44,6 @@ expanded.</p>
 
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-<h2><a name="BOOST_PREPROCESSOR_CAT">#define BOOST_PREPROCESSOR_CAT</a>(X,Y)</h2>
- <p>Obsolete. Use <a href="cat.htm#BOOST_PP_CAT">BOOST_PP_CAT</a>().</p> 
-<hr>
-
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