Merge from origin/emacs-26

Merge from origin/emacs-26

07f8f9b (origin/emacs-26) ; * lisp/ldefs-boot.el: Update.
5cec2b0 * etc/HISTORY: Update for Emacs 26.1 release.
7c474e1 * etc/AUTHORS: Update.
ddc7bea ; * ChangeLog.3: Update.
3557460 ; * admin/authors.el: Update.
2f44d2d Note caveat for backward regexp searching in docstring (Bug#3...
3145d08 Update backtrace in Emacs Lisp Intro
43a9c26 Move window-point in bibtex-search-entry
4bb2741 More fixes of Intro to Emacs Lisp
c57c226 ; * doc/emacs/misc.texi (FFAP): Fix a typo.  (Bug#31580)
0a51113 Add a footnote to Emacs Lisp Intro
5eabe4a ; * doc/emacs/msdos.texi (ls in Lisp): Fix a typo.  (Bug#31575)
d5e0ceb * lisp/help.el (with-help-window): Doc fix.  (Bug#31574)
e7952bd Fix some cross-references in emacs-lisp-intro.texi
a897959 Minor copyedits in Emacs manual in macos.texi

Conflicts:
	lisp/ldefs-boot.el