[Assurance] Add additional SceneDelegate example

Issue in /src/pages/documentation/platform-assurance-sdk/api-reference.md

We currently have the `scene(:openURLContexts)` API documented in our startSession API reference but we need to also document the `scene(:willConnectTo:options)`. This is because both delegate functions can be called with the deeplink url depending on the App status (backgrounded or foregrounded or launch). This is documented by Apple [here](https://developer.apple.com/documentation/xcode/supporting-universal-links-in-your-app).

Open /src/pages/documentation/platform-assurance-sdk/api-reference.md and review the existing scene(:openURLContexts) documentation in the startSession API reference. Add the scene(:willConnectTo:options) example and explain when each delegate receives a deep-link URL, using the linked Apple documentation for reference; done means both delegate functions are documented.

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