Add FAQ on timeout

Author: keithw

index.html

@@ -993,6 +993,11 @@ <h1>Frequently Asked Questions</h1>
   the <code>MOSH_ESCAPE_KEY</code> variable; see the Mosh man page for
   details.</p></dd>
 
+  <dt>Q: How can I make the server automatically clean up dormant sessions?</dt>
+
+  <dd><p>Please see the entries for <code>MOSH_SERVER_NETWORK_TMOUT</code>
+      and <code>MOSH_SERVER_SIGNAL_TMOUT</code> in the <i>mosh-server(1)</i> man page.</p></dd>
+
   <dt>Q: What is Mosh's security track record so far?</dt>
 
   <dd><p>Mosh 1.0 was released in March 2012. As of the release of Mosh