Welcome @MattChou, to the community!
Unfortunately, the formula for calculating the resistors was not included in the data sheet. However, it is essentially the same as for many LDOs of the last few decades:
Vout = Vref*(1+R1/R2)+R1*Iadj
with Vref=1.2V (typ.), Iadj=0.5uA (max)
Hope that helps?
Regards
/Peter
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