You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: showmydoc.m
    path of file: ./repos/bspm/thirdparty/spm8/matlabbatch/@cfg_choice
    
    the code of the file until where you have to start completion: function str = showmydoc(item, indent)

% function str = showmydoc(item, indent)
% Display help text for a cfg_choice and all of its options, without
% recursive calls to child nodes.
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

    
function str = showmydoc(item, indent)

% function str = showmydoc(item, indent)
% Display help text for a cfg_choice and all of its options, without
% recursive calls to child nodes.
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: showmydoc.m 2085 2008-09-12 10:26:59Z volkmar $

rev = '$Rev: 2085 $'; %#ok
str1 = showdoc(item.cfg_item, indent);
citems = subsref(item, substruct('.','values'));
str2{1} = 'One of the following options must be selected:';
% Display short listing of cfg_choice value items first
str3 = cell(1,numel(citems));
for k = 1:numel(citems)
    str3{k} = sprintf('* %s', subsref(citems{k}, substruct('.','name')));
end