Removed obsolete functions from the reference.

[SVN r13474]

doc/reference/dec.htm

@@ -39,10 +39,6 @@ supported.</p>
 
 <hr>
 
-<h2><a name="BOOST_PREPROCESSOR_DEC">#define BOOST_PREPROCESSOR_DEC</a>(X)</h2>
- <p>Obsolete. Use <a href="dec.htm#BOOST_PP_DEC">BOOST_PP_DEC</a>().</p> 
-<hr>
-
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