* Add madlad-400 models

* Add madlad-400 to the doc table

* Update docs/source/en/model_doc/madlad-400.md

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Fill missing details in documentation

* Update docs/source/en/model_doc/madlad-400.md

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Do not doctest madlad-400

Tests are timing out.

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Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>