Add Funccall notebook and document (#1110)

* add funccall example and doc

* revise to comments

* Update website/docs/Use-Cases/Auto-Generation.md

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

* revise

* update

* minor update

* add test notebook

* update

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Co-authored-by: Chi Wang <wang.chi@microsoft.com>