luassert annotations are missing optional assertion message as a parameter

[paigoddess]

luassert assertions support a trailing message parameter, but the annotations don't allow for that. For example, this code works (producing the custom error on failure) but the string is highlighted with the LLS warning "This function expects a maximum of 1 argument(s) but instead it is receiving 2. Lua Diagnostics.(redundant-parameter)"

    local crumb = self.engine:poll()
    assert.is_nil(crumb, 'Expected nil end of event queue')