[Docs] Improve docs for MMS loading of other languages (#24292)
* Improve docs
* Apply suggestions from code review
* upload readme
* Apply suggestions from code review
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
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Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>