There is For Iterator Subsystem block as per the given link
and There is a For Iterator block as per the below link present in the "Ports and Subsystems" Library block
I could find the For Iterator Subsystem block but not able to find the For iterator block in the "Ports and Subsystems" Library block
nor after a search in the complete Simulink Library , is the only place where "For iterator block" can be found is inside "For Iterator Subsystem"
or there is something wrong with the Matlab installation.
This is the screen shot of the blocks present in my installation of "Ports and Subsystems" Library block