all ftrace should use verb

Author: nickchen120235

Diff for: lkmpg.tex

@@ -1619,7 +1619,7 @@ \section{System Calls}
   \label{img:kernel-livepatching}
 \end{figure}
 
-For more information regarding \cpp|ftrace|, check out \href{https://www.kernel.org/doc/html/latest/trace/ftrace.html}{the kernel documentation} and \href{https://youtu.be/93uE_kWWQjs}{this talk from Steven Rostedt}.
+For more information regarding \verb|ftrace|, check out \href{https://www.kernel.org/doc/html/latest/trace/ftrace.html}{the kernel documentation} and \href{https://youtu.be/93uE_kWWQjs}{this talk from Steven Rostedt}.
 
 Before getting our hands dirty, here are some functions we need to know.