Merge from origin/emacs-28

72fc7258bf Delete references to deleted library hilit19.el
e746fc2e7b Delete stale comments from Lisp Intro manual
77613b9217 ; Delete redundant installation instructions from ebnf2ps.el

diff --cc doc/lispintro/emacs-lisp-intro.texi
Simple merge

diff --cc doc/misc/gnus.texi
Simple merge

diff --cc lisp/progmodes/ebnf2ps.el
Simple merge

diff --cc lisp/progmodes/f90.el
Simple merge

diff --cc lisp/ps-print.el
Simple merge

diff --cc lisp/vc/ediff.el
Simple merge