Typo

docs/site/index.html

@@ -90,7 +90,7 @@ <h1>Installation</h1>
       <div class="tab-box" data-tab="deployment">
         <h1>Deployment</h1>
         <p>
-          Gunicorn is an WSGI HTTP server. It is best to use Gunicorn behind an HTTP proxy server. We strongly advise you to use <a href="http://www.nginx.org/">nginx</a>.
+          Gunicorn is a WSGI HTTP server. It is best to use Gunicorn behind an HTTP proxy server. We strongly advise you to use <a href="http://www.nginx.org/">nginx</a>.
         </p>
         <p>Here's an example to help you get started with using nginx:</p>
 <pre>