[CodeStyle][Xdoctest][37,41,44] Fix example code(`paddle.Tensor.unflatten`,`paddle.Tensor.view_as_complex`,`paddle.audio.datasets.ESC50`)

[JiaViii]

PR Category

User Experience

PR Types

Others

Description

为如下API修复示例代码

• paddle.Tensor.unflatten
• paddle.Tensor.view_as_complex
• paddle.audio.datasets.ESC50

Related links

• 文档示例代码修复任务 #76545

cc @ooooo-create

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[JiaViii]

CodeStyle 和 Static check已通过 @SigureMo

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