docs: clarify NumPy to tensor conversion semantics #3733
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3733
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This tutorial uses a NumPy array to create a tensor, which can be confusing because some conversion APIs share memory while others copy. This PR adds a short note clarifying that torch.from_numpy shares memory when possible, while torch.tensor makes a copy, and that torch.as_tensor avoids a copy when possible.