address a comment

Co-authored-by: Gina Peter Banyard <[email protected]>

Author: SakiTakamachi

reference/bc/bcmath.number.xml

@@ -23,8 +23,7 @@
 
    <note>
     <simpara>
-     For more information about calculations with operators, see the documentation
-     for the methods that correspond to the operators.
+     The behavior of an overloaded operator is that of the corresponding method.
     </simpara>
    </note>
   </section>