Fixed Latex errors introduced by the instructions on how to compile CTA

doc/cta.tex

@@ -918,26 +918,26 @@ cmake -DPackageOnly:Bool=true ../CTA
 make
 \end{verbatim}
 
-Use \testtt{yum-builddep} to install all of the RPMs that CTA depends on in
+Use \texttt{yum-builddep} to install all of the RPMs that CTA depends on in
 order to be built:
 \begin{verbatim}
 sudo yum-builddep RPM/SRPMS/cta-0-0.src.rpm
 \end{verbatim}
 
-Delete and then re-create the \texttt{CTA_build} directory:
+Delete and then re-create the \texttt{CTA\_build} directory:
 \begin{verbatim}
 cd ..
 rm -rf CTA_build
 mkdir CTA_build
 \end{verbatim}
-Go into the newly re-created \textt{CTA_build} directory and run \textt{cmake}
+Go into the newly re-created \texttt{CTA\_build} directory and run \texttt{cmake}
 to preapre to make all of the CTA project and not just the source rpm:
 \begin{verbatim}
 cd CTA_build
 cmake ../CTA
 \end{verbatim}
 
-Build CTA by running \texttt{make} twice in the texttt{CTA_build} directory.
+Build CTA by running \texttt{make} twice in the texttt{CTA\_build} directory.
 \begin{verbatim}
 make
 make