GitLab

* doc/lispref/backups.texi (Making Backups): Return value of backup-buffer is
changed.

* doc/lispref/files.texi (File Attributes): Document file-selinux-context.
(Changing Files): Link to it.
(Changing Files): Document set-file-selinux-context.

* fileio.c (Ffile_selinux_context, Fset_file_selinux_context):
Doc fix.