docs: Prepare release of version 2.2

Change-Id: I3694a8791b9540fc1b926a83ff55421b47e0f2ac
Refs: #3832
diff --git a/docs/source/intro.rst b/docs/source/intro.rst
index f976b8d..27ca8df 100644
--- a/docs/source/intro.rst
+++ b/docs/source/intro.rst
@@ -97,8 +97,8 @@
 | Folder          | Description                                                         |
 +=================+=====================================================================+
 | ``model/``      | implementation of NDN base: :ndnsim:`L3Protocol`, faces             |
-|                 | (:ndnsim:`Face`, :ndnsim:`NetDeviceFace`,                           |
-|                 | :ndnsim:`AppFace`),                                                 |
+|                 | (:ndnsim:`Face`, :ndnsim:`NetDeviceLinkService`,                    |
+|                 | :ndnsim:`AppLinkService`),                                          |
 |                 | etc.                                                                |
 +-----------------+---------------------------------------------------------------------+
 | ``NFD/``        | submodule of `NDN Forwarding Daemon (NFD)`_ source code with few    |