Fix typos.

article/the-article.tex

@@ -30,7 +30,8 @@ most paper looks like that}
 \begin{figure}[!h]
   \centering
   \includegraphics[width=0.9\textwidth]{the-figure}
-  \caption{how to verify and/or validate this figure?}
+  \caption{how to verify and/or validate this figure?\\
+  produced with Guix commit \texttt{b94724e8b2102be0fe9d19e9dfe44d6f7101bd4b}}
 \end{figure}
 
 \subsection*{The result you want to verify}

exos/do-pdf.sh

@@ -3,3 +3,7 @@
 guix time-machine -C channels.scm                \
      -- shell --container -m manifest.scm        \
      -- rubber --pdf exos-tuto-Guix-UGA2022.tex
+
+guix time-machine -C channels.scm                \
+     -- shell --container -m manifest.scm        \
+     -- rubber --pdf exos_answers-tuto-Guix-UGA2022.tex

exos/exos-tuto-Guix-UGA2022.tex

@@ -100,7 +100,7 @@
     \texttt{language}
     \item Display the information corresponding to the Julia package
     \item Install the Julia package and start the Julia REPL (\texttt{julia},
-      quite \emph{Control-D})
+      quit \emph{Control-D})
     \item Install other Julia packages: PyPlot and DataFrames
   \end{enumerate}
 \end{frame}