Fixed code examples in components/http_foundation

Author: wouterj

components/http_foundation/introduction.rst

@@ -9,7 +9,7 @@ The HttpFoundation Component
     specification.
 
 In PHP, the request is represented by some global variables (``$_GET``,
-``$_POST``, ``$_FILE``, ``$_COOKIE``, ``$_SESSION``...) and the response is
+``$_POST``, ``$_FILE``, ``$_COOKIE``, ``$_SESSION``, ...) and the response is
 generated by some functions (``echo``, ``header``, ``setcookie``, ...).
 
 The Symfony2 HttpFoundation component replaces these default PHP global