Merge from origin/emacs-27

3f2788d4ac (origin/emacs-27) project--vc-list-files: Recurse into sub...
f0da3aa83e Merge branch 'emacs-27' of git.savannah.gnu.org:/srv/git/e...
3b199614cc Minor improvements of buffer documentation
e1e0a7a751 xref--collect-matches: Speed up on remote
219b91eb2c ; project--find-regexp-in-files: Avoid prepending remote-i...