(Debugging): Fix typo.

(Debugging): Fix typo.
(Error Debugging): Document eval-expression-debug-on-error.
(Function Debugging): Update example.
(Using Debugger): Mention starred stack frames.
(Debugger Commands): Document `j' and `l'.
(Invoking the Debugger): `d' and `j' exit recursive edit too.
Update the messages that the debugger displays.
(Internals of Debugger): Add cross reference.  Update example.
(Excess Open): Minor improvement.
(Excess Close): Minor improvement.