More changes in the Emacs manual

More changes in the Emacs manual

* doc/emacs/text.texi (Words, Foldout, Table Conversion): Clarify
text.  Reported by Gijs Hillenius <gijs@hillenius.net> in
emacs-manual-bugs@gnu.org.

* doc/emacs/msdos.texi (Windows Keyboard):
* doc/emacs/msdos-xtra.texi (MS-DOS Keyboard):
* doc/emacs/macos.texi (Mac / GNUstep Basics):
* doc/emacs/glossary.texi (Glossary):
* doc/emacs/custom.texi (Function Keys, Init Syntax):
* doc/emacs/commands.texi (User Input):
* doc/emacs/basic.texi (Arguments): Fix capitalization of "Meta".
* doc/emacs/msdos.texi (Windows Keyboard):
* doc/emacs/dired.texi (Dired Updating):
* doc/emacs/custom.texi (Init Rebinding): Fix misuses of @key.
Suggested by Richard Stallman <rms@gnu.org>.