docs: Update documentation for the release of ndnSIM 2.3

Change-Id: I3d23bcf29f4858049d1040a3e421e1c7151b3ee1
Refs: #3876
diff --git a/docs/source/tutorial.rst b/docs/source/tutorial.rst
index d74bdf0..05a5ace 100644
--- a/docs/source/tutorial.rst
+++ b/docs/source/tutorial.rst
@@ -21,7 +21,7 @@
     intro
     getting-started
     faq
-    examples   
+    examples
     helpers
     cs
     fw
@@ -43,8 +43,9 @@
 -------
 
 If you refer to ndnSIM in a published work, please cite the following papers, not just the ndnSIM website. Thank you!
-    **S. Mastorakis, A. Afanasyev, I. Moiseenko, and L. Zhang, "ndnSIM 2.0: A new version of the NDN simulator for NS-3," NDN, Technical Report NDN-0028, 2015** (`PDF <http://named-data.net/techreport/ndn-0028-1-ndnsim-v2.pdf>`__, `BibTex <http://lasr.cs.ucla.edu/afanasyev/bibwiki/bibtex/399>`__)
 
-    **A. Afanasyev, I. Moiseenko, and L. Zhang, "ndnSIM: NDN simulator for NS-3," NDN, Technical Report NDN-0005, 2012** (`PDF <http://named-data.net/wp-content/uploads/TRndnsim.pdf>`__, `BibTex <http://lasr.cs.ucla.edu/afanasyev/bibwiki/bibtex/367>`__)
+- **S. Mastorakis, A. Afanasyev, I. Moiseenko, and L. Zhang, "ndnSIM 2: An updated NDN simulator for NS-3," NDN, Technical Report NDN-0028, Revision 2, 2016** (`PDF <https://named-data.net/wp-content/uploads/2016/11/ndn-0028-2-ndnsim-v2.pdf>`__, `BibTex <http://lasr.cs.ucla.edu/afanasyev/bibwiki/bibtex/399>`__)
+
+- **A. Afanasyev, I. Moiseenko, and L. Zhang, "ndnSIM: NDN simulator for NS-3," NDN, Technical Report NDN-0005, 2012** (`PDF <https://named-data.net/wp-content/uploads/TRndnsim.pdf>`__, `BibTex <http://lasr.cs.ucla.edu/afanasyev/bibwiki/bibtex/367>`__)
 
 .. * :ref:`search`