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review feedback

* Accelerate in "NumPy 1.21+".

I thought the NumPy 1.20.0 release note decommissioned "the Accelerate library as a candidate" but it doesn't mention BLAS.

https://github.com/numpy/numpy/pull/15759/files#diff-6fde01624b4d27874d419c0f8aeae3743c4f5e7e1c9f2b039eb453a714d0cbb1R396 seems to affect both but

mattip/numpy,jakirkham/numpy,seberg/numpy,simongibbons/numpy,rgommers/numpy,mhvk/numpy,mhvk/numpy,simongibbons/numpy,pdebuyl/numpy,mattip/numpy,rgommers/numpy,seberg/numpy,simongibbons/numpy,numpy/numpy,anntzer/numpy,mattip/numpy,mhvk/numpy,rgommers/numpy,rgommers/numpy,jakirkham/numpy,anntzer/numpy,numpy/numpy,endolith/numpy,jakirkham/numpy,mattip/numpy,charris/numpy,jakirkham/numpy,numpy/numpy,anntzer/numpy,endolith/numpy,charris/numpy,pdebuyl/numpy,charris/numpy,numpy/numpy,mhvk/numpy,anntzer/numpy,endolith/numpy,pdebuyl/numpy,pdebuyl/numpy,simongibbons/numpy,seberg/numpy,simongibbons/numpy,endolith/numpy,charris/numpy,mhvk/numpy,jakirkham/numpy,seberg/numpy