Merge from origin/emacs-28

ae1ace1cf4 Adjust help-fns.el tests for recent change
04bdcf4aaa * src/terminal.c (Fframe_terminal): Use active voice
7fa491a9e9 Improve 'terminal-live-p' docstring some more
b9ac8c29ae Improve terminal-live-p docstring
0b4c81a152 * lisp/net/tramp-gvfs.el (tramp-gvfs-dbus-event-vector): F...
8f8373170f * lisp/progmodes/cperl-mode.el: Don't mention obsolete arc...
25bc330a6d Make 'describe-function' say "byte-compiled" when appropriate
2b31e667be ;Improve documentation of locale-specific string comparison

diff --cc doc/lispref/strings.texi
Simple merge

diff --cc lisp/help-fns.el
Simple merge

diff --cc lisp/net/tramp-gvfs.el
Simple merge

diff --cc lisp/progmodes/cperl-mode.el
Simple merge

diff --cc src/terminal.c
Simple merge

diff --cc test/lisp/help-fns-tests.el
Simple merge