[issue45364] Add more documentation for ModuleSpec.loader_state.

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[issue45364] Add more documentation for ModuleSpec.loader_state.

New submission from Eric Snow : Currently ModuleSpec.loader_state is documented briefly once in the importlib docs. [1] It should have more explanation, e.g. about when/why it should be used. It should also be mentioned meaningfully in the MetapathFinder [2] and Loader [3] docs, as well as