It is correct - Common and NO on the switches to the Signal and Minus pins on the board. Endstops are NOT something that will create magic smoke and destroy a board . Only other recommendation is to move slowly - trigger endstop manually to test the integrity of the wiring (check with M119 command) - and use 1mm movements to test the automatic triggering. The problem I first experienced was in not matching the endstop to the stepper it is associated with. If that happens, you will hear a lot of loud clicking until the homing process times itself out (or you hit an emergency stop). Enjoy and create chips.