[CodeStyle][Xdoctest][9-11、14]Fix example code(`paddle.Tensor. (bernoulli_，cond，digamma，get_tensor)`)

[SidusAntares]

PR Category

User Experience

PR Types

Others

Description

为如下 API 修复示例代码

• paddle.Tensor.bernoulli_
• paddle.Tensor.cond
• paddle.Tensor.digamma
• paddle.Tensor.get_tensor

Related links

• #76545

@ooooo-create

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