polish 3 LSTM en doc (#20383)
* polish en doc, test=document_fix, test=develop * update sample code, test=document_fix, test=develop * fix sample typo, test=document_fix, test=develop
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Fork自 PaddlePaddle / Paddle
* polish en doc, test=document_fix, test=develop * update sample code, test=document_fix, test=develop * fix sample typo, test=document_fix, test=develop