A denormalization example in the dockblock for transforms.Normalize

[hijarian]

For the transforms.Normalize, added an explanation in the docblock on how to revert the performed normalization.

Covers #281 and #528 as the best tradeoff.

[pytorch-bot]

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[NicolasHug]

Thank you for the PR @hijarian . Honestly, I'm not sure there is much value in documenting this. It is a rather trivial operation to reverse with basic math, and there are already snippets that are easy to find in the repo (those you found above). So I would lean towards not merging this, sorry.