/usr/share/pulseaudio/alsa-mixer/paths/hdmi-output-2.conf is in pulseaudio 1:1.1-0ubuntu15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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description = HDMI / DisplayPort 3
priority = 57
[Jack HDMI/DP,pcm=8]
required = ignore
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