Prepare release 2.7

Change-Id: Ifd407be51576e78af378cafe92fa2bfa904906ae
diff --git a/docs/source/intro.rst b/docs/source/intro.rst
index aff58e1..5645b5a 100644
--- a/docs/source/intro.rst
+++ b/docs/source/intro.rst
@@ -147,7 +147,7 @@
 :ndnsim:`Consumer` shows everything what happens in :ndnsim:`Face` and :ndnsim:`Consumer`
 classes::
 
-    NS_LOG=ndn.Face:ndn.Consumer ./waf --run=ndn-simple
+    NS_LOG=ndn.Consumer ./waf --run=ndn-simple
 
 Refer to the source code and NS-3 documentation to see what logging interfaces are
 available and about details how enable one or more logging interfaces.