update allow.txt

Author: zaikunzhang

docs.html

@@ -744,8 +744,7 @@ <h2>Remarks</h2>
                                 </li>
                                 <li>
                                     Different from PDFO, which provides interfaces for Powell's code,
-                                    <a class="theme-link" href="http://www.libprima.net" target="_blank">[13]</a> provides modernized reference implementation for Powell's
-                                    methods.
+                                    <a class="theme-link" href="http://www.libprima.net" target="_blank">[13]</a> provides the modernized reference implementation for Powell's methods.
                                 </li>
                             </ol>
                         </section>