doc: Update and align all document indices

doc/tutorial/source/index.rst

@@ -1,17 +1,26 @@
 .. only:: html or latex
 
 ns-3 Tutorial
-===========================
+=============
 
-This is the *ns-3 Tutorial*. Primary documentation for the ns-3 project is
-available in five forms:
+This is the *ns-3 Tutorial*. Primary documentation for the ns-3 project is organized as
+follows:
 
-* `ns-3 Doxygen <https://www.nsnam.org/doxygen/index.html>`_: Documentation of the public APIs of the simulator
-* Tutorial *(this document)*, Manual, and Model Library for the `latest release <https://www.nsnam.org/documentation/latest/>`_ and `development tree <https://www.nsnam.org/documentation/development-tree/>`_
-* `ns-3 wiki <https://www.nsnam.org/wiki>`_
+* Several guides that are version controlled for each release (the
+  `latest release <https://www.nsnam.org/documentation/latest/>`_) and
+  `development tree <https://www.nsnam.org/ns-3-dev/documentation/>`_:
+
+  * Tutorial *(this document)*
+  * Installation Guide
+  * Manual
+  * Model Library
+  * Contributing Guide
+* `ns-3 Doxygen <https://www.nsnam.org/docs/doxygen/index.html>`_: Documentation of the public APIs of
+  the simulator
+* `ns-3 wiki <https://www.nsnam.org/wiki/Main_Page>`_
 
 This document is written in `reStructuredText <http://docutils.sourceforge.net/rst.html>`_ for `Sphinx <https://www.sphinx-doc.org/>`_ and is maintained in the
-``doc/tutorial`` directory of ns-3's source code.
+``doc/tutorial`` directory of ns-3's source code.  Source file column width is 100 columns.
 
 .. toctree::
    :maxdepth: 2