Make sure you have most recent copy of Igtools: https://github.com/igorkagan/Igtools (occasionally updated at Dropbox/DAG/Sources/Igtools)

1) After opening MATLAB

edit;
EditorMacro('Alt-Control-h', @ig_createHeaderComment_dag); 

Alternatively, add the above commands to startup.m.

2) PRESS Alt-Control-h while in MATLAB Editor (new or existing file)

This will add documentation template:

function ... = ...(...)
%functionname  - one line function description
%
% USAGE:
% usage example1;
% usage example2;
%		...
%
% INPUTS:
%		input 1		- exlanation
%		...
%
% OUTPUTS:
%		output1		- explanation
%		...
%
% REQUIRES:	...
%
% See also ...
%
%
% Author(s):	..., DAG, DPZ
% URL:		http://www.dpz.eu/dag
%
% Change log:
% yyyymmdd:	Created function (Author(s) firstname familyname)
% ...
% $Revision: 1.0 $  $Date: 2015-08-07 18:27:53 $
 
% ADDITIONAL INFO:
% ...
%%%%%%%%%%%%%%%%%%%%%%%%%[DAG mfile header version 1]%%%%%%%%%%%%%%%%%%%%%%%%% 

Thanks to:

Yair M. Altman

http://www.mathworks.com/matlabcentral/fileexchange/24615-editormacro-assign-a-macro-to-a-keyboard-key-stroke-in-the-matlab-editor-and-command-window

http://undocumentedmatlab.com/blog/editormacro-assign-a-keyboard-macro-in-the-matlab-editor