Upgrade docs AppKit & WalletKit

[ignaciosantise]

Summary

• [x] All Upgrade AppKit Guides

Upgrade WalletKit Guides

• [x] flutter
• [x] ios
• [x] Android
• [x] RN
• [x] unity
• [x] web

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Name	Status	Preview	Comments	Updated (UTC)
reown-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 16, 2024 0:32am

[rohit-710]

@ignaciosantise @rtomas, this looks good to me. Should I merge it to main?