/usr/share/irssi/help/dehilight is in irssi 0.8.15-4ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | DEHILIGHT %|<id>|<mask>
Removes the specified item from highlight list.
See also: HILIGHT
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