Yes you can directly connect these pins to GND or V+.

Using a resistor instead of a hard connection might be convenient when you need to change the address on a finished PCB: you can short the pin to the opposite supply rail without damaging anything.

Yes you can directly connect these pins to GND or V+.

The reason you did not find this explicitly stated is that it is standard that a high-impedance digital input can be connected directly to a logical 0 or 1. When a resistor was needed this would be stated explicitly.

Using a resistor instead of a hard connection might be convenient when you need to change the address on a finished PCB: you can short the pin to the opposite supply rail without damaging anything.