bug#22467: 24.5; Doc "Delete Selection Mode"

[B.V. Raghav]

This is a documentation enhancement request:

Where: (emacs)Top > Mark > Using Region
   `C-h i d m Emacs RET m Using Region RET`

What:
Change the paragraph from:

   By default, text insertion occurs normally even if the mark is
   active―for example, typing ‘a’ inserts the character ‘a’, then
   deactivates the mark.  If you enable Delete Selection mode, a minor
   mode, then inserting text while the mark is active causes the text in
   the region to be deleted first.  To toggle Delete Selection mode on
   or off, type ‘M-x delete-selection-mode’.

Change to:

   By default, text insertion occurs normally even if the mark is
   active―for example, typing ‘a’ inserts the character ‘a’, then
   deactivates the mark.

   On the other hand, if you enable Delete Selection mode, a minor
   mode, then inserting text while the mark is active causes the text in
   the region to be deleted first.  To toggle Delete Selection mode on
   or off, type ‘M-x delete-selection-mode’.

Rationale:

    I essentially only introduced a paragraph change and an
    interjection. However, I believe that is necessary to make the
    distinction between the words `deactivate' and `delete' which are
    confused to be similar in the flow of reading.

    To illustrate, read the following successively:
    `inserts the character ‘a’, then deactivates the mark'
    `inserting [...] causes the text [...] to be deleted first'

    Though different words, `deactivate' and `delete', they get minced
    in the quick read, and are at least mistaken to be of similar
    behaviour, which is potentially misleading. And the fact is
    `deactivate'-ing the mark is normal behaviour of emacs, and
    `delete'-ing is a special behaviour for intended folks.

Inspiration:

    http://article.gmane.org/gmane.emacs.help/108581
    http://article.gmane.org/gmane.emacs.help/108583
    http://article.gmane.org/gmane.emacs.help/108591




In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2015-10-25 on trouble, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11703000
System Description:     Debian GNU/Linux testing-updates (sid)

Configured using:
 `configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 
--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes
 
--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --with-x=yes --with-x-toolkit=lucid --with-toolkit-scroll-bars
 --without-gconf --without-gsettings 'CFLAGS=-g -O2
 -fstack-protector-strong -Wformat -Werror=format-security -Wall'
 CPPFLAGS=-D_FORTIFY_SOURCE=2 LDFLAGS=-Wl,-z,relro'

Important settings:
  value of $LANG: en_IN
  locale-coding-system: iso-latin-1-unix

Major mode: Info

Minor modes in effect:
  TeX-PDF-mode: t
  minibuffer-depth-indicate-mode: t
  icicle-mode: t
  icicle-ido-like-mode: 127
  global-subword-mode: t
  subword-mode: t
  show-paren-mode: t
  electric-pair-mode: t
  display-battery-mode: t
  display-time-mode: t
  global-reveal-mode: t
  reveal-mode: t
  global-linum-mode: t
  linum-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Wrote /home/bvr/academics/misc/gl/inc/bvr/sosys/TransformSeq.hpp
Mark set
Saving file /home/bvr/academics/misc/gl/inc/bvr/sosys/TransformSeq.hpp...
Wrote /home/bvr/academics/misc/gl/inc/bvr/sosys/TransformSeq.hpp
Composing main Info directory...done
Computing completion candidates...
Found `delete-selection-mode' in Command Index.  (Only match)
Mark saved where search started
Mark set [2 times]
Computing completion candidates...

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mm-bodies mm-encode mail-parse ...)

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