fix old doctests
fix old doctests

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