typo in user guide

jupysketch-doc/docs/index.md

@@ -29,4 +29,4 @@ You can use the binder link in jupytersketcher Github to see some experiments wi
 
 ## Main benefit
 
-With Pysketcher for Jupyter mechanical notebooks, you get a single copy of the description of the problem which is as well a space to simulate and system behaviour
+With Pysketcher for Jupyter mechanical notebooks, you get a single copy of the description of the problem which is as well a space to simulate the system behaviour

jupysketch-doc/site/index.html

@@ -332,7 +332,7 @@
 <li>Animating sketches within Jupyter notebooks</li>
 </ul>
 <h2 id="main-benefit">Main benefit</h2>
-<p>With Pysketcher for Jupyter mechanical notebooks, you get a single copy of the description of the problem which is as well a space to simulate and system behaviour</p>
+<p>With Pysketcher for Jupyter mechanical notebooks, you get a single copy of the description of the problem which is as well a space to simulate the system behaviour</p>