Bug 979669 - [marionette-js-client] The documentation for the tap function is not correct.

tagname function

add     * @return {Object} self.	on line 199

tap function

delete [] of variable x				on line 213
delete [] of variable y				on line 214
set     {function} callback boolean argument.	on line 215
add     * @return {Object} self.		on line 216