iOS purchase verification steps

[Sporiff]

This PR includes a POC change for purchase verification steps in the iOS SDK.

Relates to https://adjustcom.atlassian.net/browse/ADAPP-17342

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
dev-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 15, 2024 11:18am

[Sporiff]

@uerceg as discussed yesterday, this is what I'm imagining the purchase verification steps will look like. Quite simply, we remove content relating to these properties from the article and put everything that is PV-specific in its own section while linking back to the purchase verification article. This article isn't live right now, so the link won't work, but that's the gist of it.

Let me know if you have any feedback or can think of anything else we might need to include. If this is okay, we can go ahead and do the same for the other SDKs.

https://dev-docs-git-purchase-verification-steps-product-content.vercel.app/en/sdk/ios/features/events#purchase-verification

[uerceg]

@Sporiff Sounds good to me. One advice might be to move the Purchase Verification chapter below Record event revenue chapter because the verification of the passed revenue sounds like a natural extension of the recording event revenue (so reading those one after another sounds nicer to me).

[Sporiff]

@uerceg Good shout. Done.