Update injectable docs with info on memoization
Update injectable docs with info on memoization

[ci-skip]

ual/urbansim,synthicity/urbansim,bricegnichols/urbansim,UDST/urbansim,UDST/urbansim,bricegnichols/urbansim,apdjustino/urbansim,AZMAG/urbansim,SANDAG/urbansim,SANDAG/urbansim,synthicity/urbansim,apdjustino/urbansim,VladimirTyrin/urbansim,synthicity/urbansim,waddell/urbansim,bricegnichols/urbansim,SANDAG/urbansim,ual/urbansim,VladimirTyrin/urbansim,synthicity/urbansim,waddell/urbansim,AZMAG/urbansim,waddell/urbansim,UDST/urbansim,ual/urbansim,apdjustino/urbansim,VladimirTyrin/urbansim,AZMAG/urbansim,VladimirTyrin/urbansim,AZMAG/urbansim,SANDAG/urbansim,apdjustino/urbansim,ual/urbansim,waddell/urbansim,bricegnichols/urbansim,UDST/urbansim