Checked emacs.texi

Checked emacs.texi

* doc/emacs/emacs.texi (Top, Preface): Small rephrasings.
(menu, detailmenu): Update entries, and reformat some descriptions.
* doc/emacs/building.texi, doc/emacs/display.texi:
* doc/emacs/emacs-xtra.texi, doc/emacs/files.texi:
* doc/emacs/frames.texi, doc/emacs/kmacro.texi, doc/emacs/msdog.texi:
* doc/emacs/programs.texi, doc/emacs/text.texi:
Reformat some menu descriptions.

* admin/FOR-RELEASE: Related markup.