Minor edit of comments in attentive_neural_process.ipynb.

[christabella]

Comments on sampling from either prior (during testing) or the posterior (during training) are swapped.

"Note that targets contain contexts by design" -> is this is referring to how the latent encoder had previously been run on the contexts, rather than the targets themselves actually containing contexts?

Thanks!

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[christabella]

@googlebot I signed it!

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