fix default values of Flux guidance_scale in docstrings

[catwell]

Note: I just fixed the docstrings so they match the actual params.

I did not check what the actual values should be for each pipeline. Also there is discrepancy with the values used in the examples at the top of the files.

[a-r-r-o-w]

Thanks! I think the values you mentioned is perfect and not the ones at the top of the file example

[HuggingFaceDocBuilderDev]

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