Correct AC input wiring for electronic door lock PSU
Green/Yellow wire is always the protective earth/ground wire, it must never be used for anything else, so it is not Neutral.
It says in that document that the other two wires are mains input. You can use 100 to 240 volts mains. So yes, one of them is the Live and the other can be the Neutral. Pick any way you like.
But you must connect the earth/ground, so if you are wiring this to a mains plug, you must use a 3-prong mains plug with earth/ground pin, and it must be connected to a mains outlet that provides the earth/ground so it must not be connected to a 2-prong outlet.