Minor nit to prevent dropping a space in the HTML generation.

Doc/ext/ext.tex

@@ -173,8 +173,8 @@ variable stores the ``associated value'' of the exception (the second
 argument to \keyword{raise}).  A third variable contains the stack
 traceback in case the error originated in Python code.  These three
 variables are the \C{} equivalents of the Python variables
-\code{sys.exc_type}, \code{sys.exc_value} and \code{sys.exc_traceback}
-(see the section on module \module{sys} in the \emph{Python Library
+\code{sys.exc_type}, \code{sys.exc_value} and \code{sys.exc_traceback} (see
+the section on module \module{sys} in the \emph{Python Library
 Reference}).  It is important to know about them to understand how
 errors are passed around.