array-overview.rst edited to reflect current functionality
array-overview.rst edited to reflect current functionality

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