Web API: WN 10 Preview 5

[wadepickett]

Contributes to #35473
See Web API discussion here: #35473 (comment)

Move the suggested content into a What's New include file and put an code snippets into a compliable app.

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Associated WorkItem - 440550

[wadepickett]

Fixed with PR: #35587 last week but forgot to link the issue to the PR.