A few fixes

chap2.tex

@@ -224,11 +224,11 @@ \subsection{Committing the Uncommitted}
 To understand what Klaus was getting in a spin about, let's make a change to \texttt{my\_second\_committed\_file} now and see how this affects things.
 Remember we have already added the file, but we haven't yet made a commit.
 
-\begin{callout}{Note}{A little Linux note}It should be noted that there is a subtle difference between \testtt{>} and \texttt{>>}.
+\begin{callout}{Note}{A little Linux note}It should be noted that there is a subtle difference between \texttt{>} and \texttt{>>}.
 The former will \emph{redirect} the result of a command to a file, overwriting its contents.
 A double arrow appends the result of a command to the specified file.
 We use both of them in the examples as a way to show how we can simulate changing a file completely and appending extra lines to a file.
-\end
+\end{callout}
 
 \begin{code}
 john@satsuki:~/coderepo$ echo "Change2" >> my_second_committed_file