[Dev-luatex] missing signature in the manual

[Elie Roux]

Hello,

In the manual one can read:

This callback allows you to replace the way LuaTeX fetches lexical tokens.
function()
     return <table> token
end

I think that the argument(s) of function are missing. Also about 
buildpage_filter:

function(<string> extrainfo)
end

the function doesn't need to return anything?

Finally the char_exists callback is not documented but is in callback.list()

Thank you!
-- 
Elie