[All hosts] (NAA) add NestedAppAuth info (#2104)

* add NestedAppAuth info

* Apply suggestions from code review

Co-authored-by: Elizabeth Samuel <[email protected]>

* add NestedAppAuth for Word and PowerPoint

* Apply suggestions from code review

* Update docs/requirement-sets/requirement-sets.md

* Update docs/requirement-sets/requirement-sets.md

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Co-authored-by: Elizabeth Samuel <[email protected]>

Author: davidchesnut