bug#4482: 23.1.50; "Mode Line" in the Emacs manual "Needs Work"(TM)

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug <at> gnu.org mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

This node of the manual has several problems:

 . It does not mention the " <at> " character that is put in the mode line
   of emacsclient frames.

 . It does not explain what do I>, I+, and I <at>  input method indications
   mean.  The cross-reference to the "Input Methods" node does not
   help, because this issue is not explained there, either (nor should
   it be, IMO).

 . The differences between text-mode and GUI terminals are mentioned
   in a way that is hard to read.  I would suggest to rewrite the text
   using an  <at> itemize list, with a separate  <at> item for each indicator
   that can be in the mode line, and for those that can only appear on
   text-mode terminals, say just that.

 . For a user on a text-mode terminal, where a mouse cannot be used to
   have the value that corresponds to the indicator spelled out, it
   would be good to mention variables that hold those values, so that
   the user could evaluate them when she needs that.  For example, the
   mnemonics for the various coding-systems can be seen by evaluating