Added ???_R and ???_D macros to reference

[SVN r12910]

doc/reference/list_append.htm

@@ -56,6 +56,10 @@
 
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+<h2><a name="BOOST_PP_LIST_APPEND_D">#define BOOST_PP_LIST_APPEND_D</a>(D,L,P)</h2>
+ <p>Can be used inside <a href="while.htm#BOOST_PP_WHILE">BOOST_PP_WHILE</a>().</p> 
+<hr>
+
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