zipf: Small changes (style and small logic correction) and adding documentation section
diff --git a/examples/wscript b/examples/wscript
index c00bad6..c3fc672 100644
--- a/examples/wscript
+++ b/examples/wscript
@@ -7,8 +7,8 @@
     obj = bld.create_ns3_program('ndn-grid', ['ndnSIM', 'point-to-point-layout'])
     obj.source = 'ndn-grid.cc'
     
-    obj = bld.create_ns3_program('zipf-mandelbrot', ['ndnSIM', 'point-to-point-layout'])
-    obj.source = 'zipf-mandelbrot.cc'
+    obj = bld.create_ns3_program('ndn-zipf-mandelbrot', ['ndnSIM', 'point-to-point-layout'])
+    obj.source = 'ndn-zipf-mandelbrot.cc'
     
 
     obj = bld.create_ns3_program('ndn-simple-with-content-freshness', ['ndnSIM'])