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d739b7a5 - [docs] move host-offloading content to 201/memory-spaces.md, other moves

[docs] move host-offloading content to 201/memory-spaces.md, other moves The other moves are putting type_[promotion.rst and rank_promotion_warning.rst in the 101 docs, and moving "API compatibility" and "Python and NumPy version support policy" to the top level, so that we can remove the "Notes" section entirely.