Apple View Hierarchy Docs

[philipphofmann]

Add docs for the view hierarchy feature to the Apple docs added with getsentry/sentry-cocoa#2491.

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[brustolin]

We are waiting to have the new View hierarchy feature to be available in the product to update the docs.

[philipphofmann]

Fixed with #6091.