examples: Fixing outdated instructions

Change-Id: I675d6837273442a1443adeee2182c8aace611a22
diff --git a/examples/ndn-simple-with-content-freshness.cpp b/examples/ndn-simple-with-content-freshness.cpp
index baef23c..9cac54d 100644
--- a/examples/ndn-simple-with-content-freshness.cpp
+++ b/examples/ndn-simple-with-content-freshness.cpp
@@ -39,7 +39,7 @@
  * corresponding data packet will not be considered fresh for more than 2 seconds (can be cached
  * for a shorter time, if entry is evicted earlier)
  *
- *     NS_LOG=DumbRequester ./waf --run ndn-simple-with-content-freshness
+ *     NS_LOG=OneInterestRequester ./waf --run ndn-simple-with-content-freshness
  */
 
 int