docs: api-pipelines-qwenimage typo fix

[Manith-Ratnayake]

Fixes a minor documentation typo in the Qwen-Image pipeline example:

https://huggingface.co/docs/diffusers/main/api/pipelines/qwenimage

A problem in this line

    prompt="put the penguin and the cat at a game show called "Qwen Edit Plus Games"", 

The quotation marks break the syntax.

There are number of ways to fix the problem. But I used already used the below method of 3 single quotes in the Qwen-Image page
https://huggingface.co/Qwen/Qwen-Image

I fix syntax problem by

    prompt='''put the penguin and the cat at a game show called "Qwen Edit Plus Games"''', 

@stevhliu and @sayakpaul

[stevhliu]

Thanks for the fix!

[HuggingFaceDocBuilderDev]

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