examples: Added simulation scenario with MPI support

docs: Update documentation to include instructions
for MPI support and scenario executed in parallel

Change-Id: I5235462cad6f01751bcd5141b2c3e14585d5baa3
Refs: #2504
diff --git a/docs/source/examples.rst b/docs/source/examples.rst
index 6561be5..521b0e2 100644
--- a/docs/source/examples.rst
+++ b/docs/source/examples.rst
@@ -417,6 +417,11 @@
 
         NS_LOG=ndn.Consumer:ndn.Producer ./waf --run=ndn-grid-multiple-strategies
 
+Simple parallel scenario using MPI
+----------------------------------
+
+:ref:`simple scenario with MPI support`
+
 3-level binary tree with packet-level trace helpers
 ---------------------------------------------------