markup nit

Doc/lib/libatexit.tex

@@ -40,11 +40,10 @@ order.  The assumption is that lower level modules will normally be
 imported before higher level modules and thus must be cleaned up
 later.
 
-If an exception is raised during execution of the exit handlers, a traceback
-is printed (unless SystemExit is raised) and the exception information is
-saved.  After all exit handlers have had a chance to run the last exception
-to be raised is reraised.
-
+If an exception is raised during execution of the exit handlers, a
+traceback is printed (unless \exception{SystemExit} is raised) and the
+exception information is saved.  After all exit handlers have had a
+chance to run the last exception to be raised is re-raised.
 \end{funcdesc}