fix(usage): minor reformulation

contents/user-usage.tex

@@ -15,8 +15,8 @@
 
 \rotare is fully controlled by a single input file, where the user specifies the
 simulation parameters, the rotor geometry, the flow conditions, etc. See
-Chapter~\ref{chap:user:input} for details about this configuration file. In
-theory this is the only place that requires user's attention.
+Chapter~\ref{chap:user:input} for details about this configuration file. This is
+the only place that requires user's attention.
 
 First of all, make sure you are in the \directory{rotare/src/} directory, or
 that it is in \matlab's Path.
@@ -35,9 +35,9 @@ rotare
 rotare('configs/my_config.m')
 \end{lstlisting}
 
-\rotare comes with a few test configs (a template file and some reproduction of
-experimental results). You can verify that everything is working as intended by
-running any of these files:
+\rotare comes with a few test configuration files (a template file and some
+reproduction of experimental results). You can verify that everything is working
+as intended by running any of these files:
 \begin{lstlisting}[language=matlab]
 rotare('configs/template.m')
 \end{lstlisting}