fixed README

Author: fabpot

UPGRADE-2.2.md

@@ -1,17 +1,17 @@
 UPGRADE FROM 2.1 to 2.2
 =======================
 
- * The ``_internal`` route is not used any more. It should then be removed from
-   both your routing and security configurations. A ``router_proxy`` key has
+ * The ``_internal`` route is not used any more. It should then be removed
+   from both your routing and security configurations. A ``framgents`` key has
    been added to the framework configuration and must be specified when ESI or
    Hinclude are in use. No security configuration is required for this path as
-   by default ESI access is only permitted for trusted hosts and Hinclude access
-   uses an URL signing mechanism.
+   by default ESI access is only permitted for trusted hosts and Hinclude
+   access uses an URL signing mechanism.
 
    ```
    framework:
        # ...
-       router_proxy: { path: /_proxy }
+       fragments: { path: /_proxy }
    ```
 
 Functional Tests