Markup fix.

Doc/lib/libtextwrap.tex

@@ -54,7 +54,7 @@ edge of the display, while still presenting them in the source code
 in indented form.
 
 Note that tabs and spaces are both treated as whitespace, but they are
-not equal: the lines \code{" {} hello"} and \code{"\textbackslash{}thello"}
+not equal: the lines \code{" {} hello"} and \code{"\e thello"}
 are considered to have no common leading whitespace.  (This behaviour is
 new in Python 2.5; older versions of this module incorrectly expanded
 tabs before searching for common leading whitespace.)