Fix path for plugin server demo

Change-Id: I571315051009b3ee9e333f2075be298c62752e46
diff --git a/dev/demo/plugin-server.html b/dev/demo/plugin-server.html
index 5065d41..491708d 100644
--- a/dev/demo/plugin-server.html
+++ b/dev/demo/plugin-server.html
@@ -10,7 +10,7 @@
     <script data-main="/demo/plugin-serverdemo.js" src="/js/lib/require.js" async="async"></script>
   </head>
   <body>
-    <p>Start the demo server with <code>morbo -l 'http://*:3003' t/plugin-server.pl</code> and open <a href="http://localhost:3003/demo/plugin-server.html"><code>this website</code></a>.</p>
+    <p>Start the demo server with <code>morbo -l 'http://*:3003' t/server/plugin.pl</code> and open <a href="http://localhost:3003/demo/plugin-server.html"><code>this website</code></a>.</p>
     <main>
       <div id="search">
         <ol>