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* Fix typos, update, add Copyright info, and trim trailing whitespace

* Update docs/source/en/api/pipelines/text_to_video_zero.md
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* 1 second is not a long video, but 6 seconds is

* Update text_to_video_zero.md

* Update text_to_video_zero.md

* Update text_to_video_zero.md

* Update wuerstchen.md

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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* why mdx?

* why mdx?

* why mdx?

* no x for kandinksy either

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Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

remove coming soon, rl pipeline