How to use 74LS245 to level up signals form 3.3V to 5V?
It does mention it. Search for VOH You will find that it is inadequate: It will only guarantee that VOH is above 2 volts under worst condition, and above 2.7 volts under "good" conditions.

Typically you'd want to take a look at the 74HCT245. It has a higher guaranteed output but a 2 volt input threshold even when driven at 5 volts.