[Kandinsky] Improve kandinsky API a bit (#3636)
* Improve docs
* up
* Update docs/source/en/api/pipelines/kandinsky.mdx
* up
* up
* correct more
* further improve
* Update docs/source/en/api/pipelines/kandinsky.mdx
Co-authored-by: YiYi Xu <yixu310@gmail.com>
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Co-authored-by: YiYi Xu <yixu310@gmail.com>
