added sess_destroy() into docs
diff --git a/user_guide/libraries/sessions.html b/user_guide/libraries/sessions.html
index 184eaec..b1ce847 100644
--- a/user_guide/libraries/sessions.html
+++ b/user_guide/libraries/sessions.html
@@ -210,8 +210,10 @@
 do not need to write your own routine to do it.</p>

 

 

+<h2>Destroying a Session </h2>

+<p>To clear the current session: </p>

+<code>$this-&gt;session-&gt;sess_destroy();</code>

 <h2>Session Preferences</h2>

-

 <p>You'll find the following Session related preferences in your <kbd>application/config/config.php</kbd> file:</p>