Normalize comments in core files
diff --git a/system/core/CodeIgniter.php b/system/core/CodeIgniter.php
index 4885f31..9714d09 100755
--- a/system/core/CodeIgniter.php
+++ b/system/core/CodeIgniter.php
@@ -230,6 +230,13 @@
 	// Load the base controller class
 	require BASEPATH.'core/Controller.php';
 
+	/**
+	 * Reference to the CI_Controller method.
+	 *
+	 * Returns current CI instance object
+	 *
+	 * @return object
+	 */
 	function &get_instance()
 	{
 		return CI_Controller::get_instance();