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b2021273 - [Docs] add an example use for `StableUnCLIPPipeline` in the pipeline docs (#2897)

[Docs] add an example use for `StableUnCLIPPipeline` in the pipeline docs (#2897) * improve stable unclip doc. * add: entry of StableUnCLIPPipeline to the docs * Apply suggestions from code review Co-authored-by: apolinario <joaopaulo.passos@gmail.com> --------- Co-authored-by: apolinario <joaopaulo.passos@gmail.com>