Some doc updates

<usage>

    <p>This directive allows for growth potential in the number of

    Balancers available for a virtualhost in addition to the

    number pre-configured. It only take effect if there is at

    number pre-configured. It only takes effect if there is at

    least 1 pre-configured Balancer.</p>

</usage>

</directivesynopsis>

    <code>http://example.com/mirror/foo/bar</code> to be internally converted

    into a proxy request to <code>http://backend.example.com/bar</code>.</p>

    <p>The following alternative syntax is possible, however carries a

    performance penalty when present in large numbers:</p>

    <p>The following alternative syntax is possible, however it can carry a

    performance penalty when present in very large numbers. The advantage of

    the below syntax is that it allows for dynamic control via the

    <a href="mod_proxy_balancer.html#balancer_manager">Balancer Manager</a> interface:</p>

    <example>

        ProxyPass /mirror/foo/ http://backend.example.com/

    <p>You can now access load balancer manager by using a Web browser

    to access the page

    <code>http://your.server.name/balancer-manager</code></p>

    <code>http://your.server.name/balancer-manager</code>. Please note

    that only Balancers defined outside of <code>&lt;Location ...&gt;</code>

    containers can be dynamically controlled by the Manager.</p>

</section>

<section id="stickyness_implementation">