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/usr/share/irssi/help/wall is in irssi 0.8.17-1+deb8u5.

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%9Syntax:%9

WALL %|[<channel>] <message>

%9Parameters:%9

    The channel and the message; if no channel is given, the active channel
    will be used.

%9Description:%9

    Sends a message to all channel operators. If the server doesn't support
    WALLCHOPS or STATUSMSG it will send a notice to each channel operator
    individually.

%9Examples:%9

    /WALL I'm off for today; take care! :)
    /WALL #irssi I'm feeling supercalifragilisticexpialidocious today :D

%9See also:%9 MSG, NOTICE