Removed obsolete functions from the reference.

[SVN r13474]

doc/reference/identity.htm

@@ -51,10 +51,6 @@ invoked.</p>
 
 <hr>
 
-<h2><a name="BOOST_PREPROCESSOR_IDENTITY">#define BOOST_PREPROCESSOR_IDENTITY</a>(X)</h2>
- <p>Obsolete. Use <a href="identity.htm#BOOST_PP_IDENTITY">BOOST_PP_IDENTITY</a>().</p> 
-<hr>
-
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