Update LTX-2 Docs to Cover LTX-2.3 Models (#13337)
* Update LTX-2 docs to cover multimodal guidance and prompt enhancement
* Apply suggestions from code review
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* Apply reviewer feedback
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
