Run admin/update-copyright.

Run admin/update-copyright.

The manuals often used quotes ``...'' when it is better to use @dfn or
@code or capitalized words or no quoting at all.  For example, there is
no need for the `` and '' in “if a variable has one effect for
@code{nil} values and another effect for ``non-@code{nil}'' values”.
Reword the Emacs, Lisp intro, and Lisp reference manuals to eliminate
unnecessary quoting like this, and to use @dfn etc. instead when called
for (Bug#21472).

The PDF versions of the GNU manuals used curved single quotes to
represent grave accent and apostrophe, which made it a pain to cut
and paste code examples from them.  Fix the PDF versions to use
grave accent and apostrophe for Lisp source code, keystrokes, etc.
This change does not affect the info files, nor does it affect
ordinary uses of curved single quotes in PDF.
* doc/emacs/docstyle.texi: New file, which specifies treatment for
grave accent and apostrophe, as well as the document encoding.
* doc/emacs/emacs-xtra.texi, doc/emacs/emacs.texi:
* doc/lispintro/emacs-lisp-intro.texi:
* doc/lispref/back.texi, doc/lispref/book-spine.texi:
* doc/lispref/elisp.texi, doc/lispref/lay-flat.texi:
* doc/misc/ada-mode.texi, doc/misc/auth.texi:
* doc/misc/autotype.texi, doc/misc/bovine.texi, doc/misc/calc.texi:
* doc/misc/cc-mode.texi, doc/misc/cl.texi, doc/misc/dbus.texi:
* doc/misc/dired-x.texi, doc/misc/ebrowse.texi, doc/misc/ede.texi:
* doc/misc/ediff.texi, doc/misc/edt.texi, doc/misc/efaq-w32.texi:
* doc/misc/efaq.texi, doc/misc/eieio.texi, doc/misc/emacs-gnutls.texi:
* doc/misc/emacs-mime.texi, doc/misc/epa.texi, doc/misc/erc.texi:
* doc/misc/ert.texi, doc/misc/eshell.texi, doc/misc/eudc.texi:
* doc/misc/eww.texi, doc/misc/flymake.texi, doc/misc/forms.texi:
* doc/misc/gnus-coding.texi, doc/misc/gnus-faq.texi:
* doc/misc/gnus.texi, doc/misc/htmlfontify.texi:
* doc/misc/idlwave.texi, doc/misc/ido.texi, doc/misc/info.texi:
* doc/misc/mairix-el.texi, doc/misc/message.texi, doc/misc/mh-e.texi:
* doc/misc/newsticker.texi, doc/misc/nxml-mode.texi:
* doc/misc/octave-mode.texi, doc/misc/org.texi, doc/misc/pcl-cvs.texi:
* doc/misc/pgg.texi, doc/misc/rcirc.texi, doc/misc/reftex.texi:
* doc/misc/remember.texi, doc/misc/sasl.texi, doc/misc/sc.texi:
* doc/misc/semantic.texi, doc/misc/ses.texi, doc/misc/sieve.texi:
* doc/misc/smtpmail.texi, doc/misc/speedbar.texi:
* doc/misc/srecode.texi, doc/misc/todo-mode.texi, doc/misc/tramp.texi:
* doc/misc/url.texi, doc/misc/vhdl-mode.texi, doc/misc/vip.texi:
* doc/misc/viper.texi, doc/misc/widget.texi, doc/misc/wisent.texi:
* doc/misc/woman.texi:
Use it instead of '@documentencoding UTF-8', to lessen the need for
global changes like this in the future.
* doc/emacs/Makefile.in (EMACS_XTRA):
* doc/lispintro/Makefile.in (srcs):
* doc/lispref/Makefile.in (srcs):
Add dependency on docstyle.texi.
* doc/misc/Makefile.in (style): New macro.
(${buildinfodir}/%.info, %.dvi, %.pdf, %.html)
(${buildinfodir}/ccmode.info, ${buildinfodir}/efaq%.info, gnus_deps):
Use it.

Run admin/update-copyright.

* emacs-lisp-intro.texi:
* back.texi, book-spine.texi, lay-flat.texi:
* ada-mode.texi, auth.texi, autotype.texi, bovine.texi, calc.texi:
* cc-mode.texi, cl.texi, dbus.texi, dired-x.texi, ebrowse.texi:
* ede.texi, ediff.texi, edt.texi, efaq.texi, eieio.texi:
* emacs-gnutls.texi, epa.texi, erc.texi, ert.texi:
* eshell.texi, eudc.texi, flymake.texi, forms.texi, gnus-coding.texi:
* gnus-faq.texi, htmlfontify.texi, idlwave.texi, ido.texi, info.texi:
* message.texi, mh-e.texi, newsticker.texi, nxml-mode.texi:
* octave-mode.texi, org.texi, pcl-cvs.texi, pgg.texi, rcirc.texi:
* reftex.texi, remember.texi, sasl.texi, sc.texi, semantic.texi:
* ses.texi, sieve.texi, smtpmail.texi, speedbar.texi, srecode.texi:
* todo-mode.texi, tramp.texi, url.texi, vip.texi, viper.texi:
* widget.texi, wisent.texi, woman.texi:
Add @documentencoding.

* emacs.texi, emacs-xtra.texi:
* emacs-lisp-intro.texi:
* back.texi, book-spine.texi, elisp.texi, lay-flat.texi:
* ada-mode.texi, auth.texi, autotype.texi, bovine.texi, calc.texi:
* cc-mode.texi, cl.texi, dbus.texi, dired-x.texi, ebrowse.texi:
* ede.texi, ediff.texi, edt.texi, efaq-w32.texi, efaq.texi:
* eieio.texi, emacs-gnutls.texi, emacs-mime.texi, epa.texi, erc.texi:
* ert.texi, eshell.texi, eudc.texi, flymake.texi, forms.texi:
* gnus-coding.texi, gnus-faq.texi, gnus.texi, htmlfontify.texi:
* idlwave.texi, ido.texi, info.texi, mairix-el.texi, message.texi:
* mh-e.texi, newsticker.texi, nxml-mode.texi, octave-mode.texi:
* org.texi, pcl-cvs.texi, pgg.texi, rcirc.texi, reftex.texi:
* remember.texi, sasl.texi, sc.texi, semantic.texi, ses.texi:
* sieve.texi, smtpmail.texi, speedbar.texi, srecode.texi:
* todo-mode.texi, tramp.texi, url.texi, vip.texi, viper.texi:
* widget.texi, wisent.texi, woman.texi:
Add @documentencoding, @documentlanguage as needed.

Fixes: debbugs:16292