[INFERENCE PROVIDERS] guide on structured output (#1824)
* first draft of guide on structured output
* add to toc
* fix toc link
* more fixing
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* remove python / json tabs
* spelling
* tab placement
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
