[CodeStyle][Xdoctest][49,52-55] Fix example code(`paddle.complex`, `paddle.cuda.get_device_capability`, `paddle.cuda.get_device_name`, `paddle.cuda.get_device_properties`, `paddle.device.default_backend.get_device_properties`)

[Ricardo-shuo-liu]

PR Category

User Experience

PR Types

Others

Description

对于部分示例代码更改 代码体验提升

[paddle-bot[bot]]

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[luotao1]

@ooooo-create

[ooooo-create]

ci 和 docs 问题我晚点看看，我说之前的是你的 pr 标和描述，我 issue 里都有模板，你复制别人的 fft 系列 api 过来，我看半天也找不到啊

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :warning: Please upload report for BASE (develop@43b33c7). Learn more about missing BASE report.

Additional details and impacted files

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##             develop    #76668   +/-   ##
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  Coverage           ?   100.00%           
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  Files              ?         1           
  Lines              ?         1           
  Branches           ?         0           
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  Hits               ?         1           
  Misses             ?         0           
  Partials           ?         0           

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