Corrected documentation.

* `reStructuredText Primer <https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html>`_

* `Rst <https://docutils.sourceforge.io/docs/ref/rst/>`_

The 'Sphink' python package should be available to be able to (re)generate the documentation.

The 'Sphinx' python package should be available to be able to (re)generate the documentation.

If not available on your system yet, see below for installation instructions.

    pip install sphinx

Build Spinx from source 

-----------------------

Build Sphinx from source 

------------------------

Download the latest version from the

`Sphinx homepage <http://sphinx-doc.org/index.html>`_,

* added options for `intersphinx` entries;

* the html theme was changed.

The initial documentation could be created using:

The initial documentation could be created using::

    (cd doc; make html)