NEP: Update NEP 42 and 43 according to the current implementation

We modified the `resolve_descriptors` function to not use `context`
which is a bit heavy weight, and that also allows removing of
DTypes from the context.

This means it now passes `self, DTypes` (where self is the unbound
ArrayMethod).

Also add a note on the -1 return value of `resolve_descriptors`.

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Co-authored-by: Ross Barnowski <rossbar@berkeley.edu>

Fixup note on CastingImpl being mainly a NEP 42 name

Fixup sphinx warnings

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