fix typos

Author: jmrohwer

source/userguide_doc.rst

@@ -78,7 +78,7 @@ To begin modelling we need to start up an interactive Python shell
   ***********************************************************************
   * Welcome to PySCeS (1.0.0) - Python Simulator for Cellular Systems   *
   *                http://pysces.sourceforge.net                        *
-  * Copyright(C) B.G. Olivier, J.M. Rohwer, J.-H.S. Hofmeyr, 2004-2020  *
+  * Copyright(C) B.G. Olivier, J.M. Rohwer, J.-H.S. Hofmeyr, 2004-2021  *
   * Triple-J Group for Molecular Cell Physiology                        *
   * Stellenbosch University, ZA and VU University Amsterdam, NL         *
   * PySCeS is distributed under the PySCeS (BSD style) licence, see     *
@@ -1243,7 +1243,7 @@ General requirements
 - `GnuPlot <http://www.gnuplot.info>`_ (optional, alternative plotting back-end)
 - `IPython`_ or the `Jupyter`_ notebook (optional, highly recommended for 
   interactive modelling sessions)
-- libSBML (optional). Python bindings for SBML support van be installed via ::
+- libSBML (optional). Python bindings for SBML support can be installed via ::
 
     $ pip install python-libsbml