Fix fluid.data code example (#20227)
* fix fluid.data code example, test=develop, test=document_preview, test=document_fix * use None instead of -1 in shape, test=develop, test=document_preview, test=document_fix
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Fork自 PaddlePaddle / Paddle
* fix fluid.data code example, test=develop, test=document_preview, test=document_fix * use None instead of -1 in shape, test=develop, test=document_preview, test=document_fix