Longer macro parameter names

[SVN r13459]

doc/reference/comparison_equal.htm

@@ -30,6 +30,8 @@
  <p>Expands to <code>1</code> if <code>X == Y</code> and <code>0</code>
 otherwise.</p>
 
+<p>Both <code>X</code> and <code>Y</code> must expand to integer literals.</p>
+
 <p>For example, <code><a href="comparison_equal.htm#BOOST_PP_EQUAL">BOOST_PP_EQUAL</a>(4,4)</code> expands to <code>1</code>.</p>
 
 <h3>Uses</h3>