add docstrings to offlineHostDB
add docstrings to offlineHostDB

ChrisSchinnerl/Sia,mharkus/Sia,mharkus/Sia,ChrisSchinnerl/Sia,mnsl/Sia,rivine/rivine,MrStrong/Sia,mtlynch/Sia,mtlynch/Sia,NebulousLabs/Sia,rivine/rivine,MrStrong/Sia,johnathanhowell/Sia,NebulousLabs/Sia,ericflo/Sia,ericflo/Sia,mnsl/Sia,Mingling94/Sia