Remove strange use of $math$ mode to produce a backslash.
diff --git a/Doc/libcgi.tex b/Doc/libcgi.tex
index 988015f..3883acf 100644
--- a/Doc/libcgi.tex
+++ b/Doc/libcgi.tex
@@ -393,7 +393,8 @@
\end{verbatim}\ecode
%
Notes: The assignment to \code{sys.stderr} is needed because the traceback
-prints to \code{sys.stderr}. The \code{print "$\backslash$n$\backslash$n<PRE>"} statement is necessary to
+prints to \code{sys.stderr}.
+The \code{print "{\e}n{\e}n<PRE>"} statement is necessary to
disable the word wrapping in HTML.
If you suspect that there may be a problem in importing the traceback