Added attributes into <html> of userguide for valid html.
diff --git a/user_guide/toc.html b/user_guide/toc.html
index 465d8f4..b729b52 100644
--- a/user_guide/toc.html
+++ b/user_guide/toc.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

-<html>

+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

 <head>

 

 <title>CodeIgniter User Guide : Table of Contents</title>