remove bogus markup that caused the docs to be wrong

Doc/lib/liblogging.tex

@@ -808,7 +808,7 @@ responsible for converting a \class{LogRecord} to (usually) a string
 which can be interpreted by either a human or an external system. The
 base
 \class{Formatter} allows a formatting string to be specified. If none is
-supplied, the default value of \code{'\%(message)s\e'} is used.
+supplied, the default value of \code{'\%(message)s'} is used.
 
 A Formatter can be initialized with a format string which makes use of
 knowledge of the \class{LogRecord} attributes - such as the default value