Turn "Python Documentation Central" into just "Documentation Central"; some

Web browsers tried to wrap lines in bad ways, so we avoid the problem by
putting fewer words on the page.

Doc/html/index.html.in

@@ -91,7 +91,7 @@
            
           <ul>
             <li> <a href="http://www.python.org/doc/" class="title"
-                >Python Documentation Central</a>
+                >Documentation Central</a>
               <br>(for everyone)
           </ul>
           </td>