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Document Link（文档链接）

torch_extension/cann_ops_transformer/docs/zh/npu_flash_attn.md

Issues Section（问题文档片段）

1. 文档缺少flash attn metadata内容
2. 命名有误，应该是flash_attn/flash_attn_metadata，不带有npu_前缀

Existing Issues（存在的问题）