Re-arranged documentation, fixed comment.
diff --git a/system/libraries/Cart.php b/system/libraries/Cart.php
index ec67d9b..389b1b7 100644
--- a/system/libraries/Cart.php
+++ b/system/libraries/Cart.php
@@ -326,7 +326,7 @@
* This function permits changing item properties.
* Typically it is called from the "view cart" page if a user makes
* changes to the quantity before checkout. That array must contain the
- * rowid and qty for each item.
+ * rowid and quantity for each item.
*
* @param array
* @return bool