* lisp/dired.el (dired-ls-F-marks-symlinks): Not that this should
be set under Macos (bug#42537).
"Informs Dired about how `ls -lF' marks symbolic links.
Set this to t if `ls' (or whatever program is specified by
`insert-directory-program') with `-lF' marks the symbolic link
-itself with a trailing @ (usually the case under Ultrix).
+itself with a trailing @ (usually the case under Ultrix and macOS).
Example: if `ln -s foo bar; ls -F bar' gives `bar -> foo', set it to
nil (the default), if it gives `bar@ -> foo', set it to t.