Minor doc fixes. Remove duplicate ChangeLog entries.

Minor doc fixes.  Remove duplicate ChangeLog entries.

* doc/emacs/dired.texi (Operating on Files): Rewrite according to the fact
that `dired-do-chmod' doesn't use the `chmod' program anymore.

* lisp/faces.el (list-faces-display): Remove extra angle bracket
from `help-mode-map'.

* lisp/info.el (Info-history-toc-nodes): Doc fix.

* lisp/longlines.el (longlines-mode): Doc fix.

* src/editfns.c (Fformat_time_string): Doc fix, add tag `usage:'
to show the arg `TIME' instead of `TIMEVAL'.