[docs] fix typo, change "backoff_filter" to "backoff_factor"

[suchot]

What does this PR do?

fix a typo in docs.

Fixes # (issue)

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

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[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[github-actions]

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[muellerzr]

Thanks!