Update Cascade documentation (#7257)
* updates
* update
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* Update docs/source/en/api/pipelines/stable_cascade.md
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
* update
* update
* update
* update
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Kashif Rasul <kashif.rasul@gmail.com>
