/usr/share/irssi/help/nick is in irssi 1.0.5-1ubuntu4.
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
NICK %|<new nick>
%9Parameters:%9
Your new nickname.
%9Description:%9
Changes your nickname on the active server.
%9Examples:%9
/NICK mike
/NICK bob
%9See also:%9 CONNECT, JOIN, MSG, PART
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