/usr/share/irssi/help/unnotify is in irssi 1.0.7-1~deb9u1.
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 6 7 8 9 10 11 12 13 14 15 16 17 18 | %9Syntax:%9
UNNOTIFY %|<mask>
%9Parameters:%9
The notify pattern to remove.
%9Description:%9
Removes an entry from the notify list.
%9Examples:%9
/UNNOTIFY bob
/UNNOTIFY *!*@staff.irssi.org
%9See also:%9 AWAY, HILIGHT, NOTIFY
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