/usr/lib/NetworkManager/conf.d/10-dns-resolved.conf is in network-manager 1.10.6-2ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# We need to specify "dns=systemd-resolved" as for the time being our
# /etc/resolv.conf points to resolvconf's generated file instead of
# systemd-resolved's, so the auto-detection does not work.
dns=systemd-resolved
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