master updated (740953d1a2f -> 91b1765cd43)

[Eli Zaretskii]

eliz pushed a change to branch master.

      from  740953d1a2f Fix 'what-page'
      adds  2a8c00bfc07 * doc/emacs/back.texi: Fix a typo.
      adds  8729a2a10d9 Fix 'rmail-summary-by-thread'
      adds  1b123972636 ; Don't record multiple versions of use-package
      adds  d58d0fa52ff Introduce 'let' using lexical binding in the Lisp 
Introduction
       new  79a150ffa49 Merge from origin/emacs-29
      adds  5567ce1a9ff Handle package versions that are not version strings
       new  ccc28245c09 ; Merge from origin/emacs-29
      adds  29af214a75a Fix fontification of cgroup2 in fstab (bug#68367)
      adds  1bbb610821e Implement missing functions for custom-icon widget
      adds  4fadbfe300a Add examples to the Widget manual
      adds  824cf54951c ; * etc/TODO: Add item to make play-sound non-blocking.
      adds  63411709a8d ; Fix typos
      adds  70a09325d65 ; Fix last change in widget.texi
      adds  0c01f97b73c Wrap @pxref of Abbrevs in parentheses (bug#68375)
      adds  99efe5c80f9 Fix count of no-op functions (bug#68375)
       new  f1736571fa3 Merge from origin/emacs-29
      adds  26eb9d3a8a6 Fix typo in lispref "Creating Strings" section
       new  fe7d2bb62fb ; Merge from origin/emacs-29
      adds  c4b49488455 Don't recommend inverse-video for debugging
      adds  418547162d5 Improve documentation of Ispell commands
      adds  a08e6423ccc ; * doc/emacs/fixit.texi (Spelling): Fix last change.
      adds  c494a6e879d Improve documentation of 'emacs_function' in modules
       new  91b1765cd43 Merge from origin/emacs-29


Summary of changes:
 doc/emacs/back.texi                                |   2 +-
 doc/emacs/fixit.texi                               |  28 ++-
 doc/lispintro/emacs-lisp-intro.texi                | 171 ++++++++++++++--
 doc/lispref/functions.texi                         |   4 +-
 doc/lispref/internals.texi                         |   9 +
 doc/lispref/symbols.texi                           |   2 +-
 doc/misc/widget.texi                               | 222 +++++++++++++++++++++
 etc/DEBUG                                          |   5 -
 etc/TODO                                           |   2 +
 lisp/cus-edit.el                                   |  58 +++++-
 lisp/generic-x.el                                  |   1 +
 lisp/mail/rmailsum.el                              |  24 +--
 lisp/progmodes/python.el                           |   4 +-
 .../use-package-ensure-system-package.el           |   1 -
 14 files changed, 480 insertions(+), 53 deletions(-)