change from_s3 docstring
change from_s3 docstring

PhE/dask,jakirkham/dask,simudream/dask,cowlicks/dask,jcrist/dask,dask/dask,mikegraham/dask,clarkfitzg/dask,cpcloud/dask,clarkfitzg/dask,jayhetee/dask,freeman-lab/dask,dask/dask,jayhetee/dask,gameduell/dask,vikhyat/dask,mraspaud/dask,mrocklin/dask,blaze/dask,wiso/dask,ContinuumIO/dask,PhE/dask,pombredanne/dask,jcrist/dask,ContinuumIO/dask,blaze/dask,mraspaud/dask,freeman-lab/dask,jakirkham/dask,simudream/dask,vikhyat/dask,ssanderson/dask,chrisbarber/dask,wiso/dask,mrocklin/dask,pombredanne/dask,ssanderson/dask