move the example where it belongs

Author: vladak

intro.tex

@@ -1930,12 +1930,12 @@
 \texttt{exit(-1)}.  Based on the information in the previous paragraph,
 from \texttt{-1} you will get \texttt{255} as the return value you get in the
 shell in \texttt{\$?}.  It just creates confusion.
+Example: \example{main/return-negative-1.c}.
 \item It is very reasonable to use only \texttt{EXIT\_SUCCESS} (\texttt{0}) and
 \texttt{EXIT\_FAILURE} (\texttt{1}) unless there is a valid reason for other
 values.  Sometimes you might need more values to distinguish between failures.
 For example, the \texttt{passwd} command on Solaris have quite a few of them, go
-check its manual page if interested, section \texttt{EXIT STATUS}. Example:
-\example{main/return-negative-1.c}.
+check its manual page if interested, section \texttt{EXIT STATUS}.
 \item The difference between function \texttt{exit()} and \verb#_exit()# is that
 \texttt{exit} also flushes and closes streams (try it out with \texttt{printf()}
 \emsl{without} printing a new line), and calls functions registered via