Update rabbitmqctl(8) man page link

Author: michaelklishin

priv/www/doc/stats.html

@@ -33,7 +33,7 @@ <h2>Introduction</h2>
     <p>
       It should be read in conjunction with the manual page
       for <code>rabbitmqctl</code> (see your installation if on Unix / Linux,
-      or <a href="http://www.rabbitmq.com/man/rabbitmqctl.1.man.html">the
+      or <a href="https://www.rabbitmq.com/rabbitmqctl.8.html">the
       RabbitMQ website</a> for the latest version). Any field which can
       be returned by a command of the form <code>rabbitmqctl
       list_<i>something</i></code> will also be returned in the