Removed obsolete functions from the reference.

[SVN r13474]

doc/reference/comma.htm

@@ -47,10 +47,6 @@ for separating macro parameters.</p>
 
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-<h2><a name="BOOST_PREPROCESSOR_COMMA">#define BOOST_PREPROCESSOR_COMMA</a>()</h2>
- <p>Obsolete. Use <a href="comma.htm#BOOST_PP_COMMA">BOOST_PP_COMMA</a>().</p> 
-<hr>
-
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