bug#22559: 25.1.50; %t option of tls-program variable is not documented

[José L . Doménech]

In the description for the variable "tls-program", a notice of
the "%t" availability and meaning is missed.

How to reproduce it:
M-:
(require 'tls)
M-x describe-variable tls-program


In GNU Emacs 25.1.50.18 (x86_64-w64-mingw32)
 of 2016-02-04 built on LENOVO-PC
Repository revision: 0815944ac4a190d1402079453b99d00fcc26dc25
Windowing system distributor 'Microsoft Corp.', version 6.3.9600
Configured using:
 'configure
 PKG_CONFIG_PATH=/mingw64/lib/pkgconfig:/mingw64/share/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS

Important settings:
  value of $LANG: ESN
  locale-coding-system: cp1252

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Quit
tls
user-error: Beginning of history; no preceding item
Making completion list...
Type C-x 1 to delete the help window, C-M-v to scroll help.
You can run the command ‘describe-variable’ with C-h v
Type C-x 1 to delete the help window, C-M-v to scroll help.
Mark set
next-line: End of buffer [5 times]

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired dired-loaddefs format-spec
rfc822 mml mml-sec epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils cl-extra pp tls
gnutls help-fns help-mode easymenu cl-loaddefs pcase cl-lib time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel dos-w32 ls-lisp disp-table w32-win w32-vars
term/common-win tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help
simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote w32notify w32 multi-tty make-network-process emacs)

Memory information:
((conses 16 89627 10459)
 (symbols 56 19655 0)
 (miscs 48 48 190)
 (strings 32 16122 4462)
 (string-bytes 1 454264)
 (vectors 16 11718)
 (vector-slots 8 414726 5072)
 (floats 8 160 96)
 (intervals 56 291 54)
 (buffers 976 13))