Add iterable type into generator doc.
Add iterable type into generator doc.

ndm2/cakephp,CakeDC/cakephp,cakephp/cakephp,cakephp/cakephp,ndm2/cakephp,CakeDC/cakephp,ADmad/cakephp,CakeDC/cakephp,ADmad/cakephp,ADmad/cakephp,ndm2/cakephp,CakeDC/cakephp,cakephp/cakephp,ndm2/cakephp,cakephp/cakephp,ADmad/cakephp