Important spelling fix to CodeIgniter.php file
diff --git a/system/core/CodeIgniter.php b/system/core/CodeIgniter.php
index 793c468..349f9f2 100755
--- a/system/core/CodeIgniter.php
+++ b/system/core/CodeIgniter.php
@@ -153,7 +153,7 @@
  *
  * Note: Order here is rather important as the UTF-8
  * class needs to be used very early on, but it cannot
- * properly determine if UTf-8 can be supported until
+ * properly determine if UTF-8 can be supported until
  * after the Config class is instantiated.
  *
  */