Updating code examples in user guide to use CI_Controller instead of Controller
diff --git a/user_guide/libraries/form_validation.html b/user_guide/libraries/form_validation.html
index 18f391a..eae2036 100644
--- a/user_guide/libraries/form_validation.html
+++ b/user_guide/libraries/form_validation.html
@@ -221,7 +221,7 @@
 
 <textarea class="textarea" style="width:100%" cols="50" rows="21">&lt;?php
 
-class Form extends Controller {
+class Form extends CI_Controller {
 
 	function index()
 	{
@@ -312,7 +312,7 @@
 
 <textarea class="textarea" style="width:100%" cols="50" rows="28">&lt;?php
 
-class Form extends Controller {
+class Form extends CI_Controller {
 
 	function index()
 	{
@@ -514,7 +514,7 @@
 
 <textarea class="textarea" style="width:100%" cols="50" rows="44">&lt;?php
 
-class Form extends Controller {
+class Form extends CI_Controller {
 
 	function index()
 	{
@@ -805,7 +805,7 @@
 
 <code>
 &lt;?php<br /><br />
-class <kbd>Member</kbd> extends Controller {<br />
+class <kbd>Member</kbd> extends CI_Controller {<br />
 <br />
 &nbsp;&nbsp;&nbsp;function <kbd>signup</kbd>()<br />
 &nbsp;&nbsp;&nbsp;{&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />