fix: add missing blank lines in "Treat State as Read-Only" section

[dev-satoshi]

Added blank lines between import statements and code blocks in the relevant sample codes within the "Treat State as Read-Only" section.
Ensured consistency across all sample codes in the section for better readability.

Closes #7125

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Name	Status	Preview	Comments	Updated (UTC)
19-react-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 25, 2024 3:21pm
react-dev	✅ Ready (Inspect)	Visit Preview		Aug 25, 2024 3:21pm

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Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[rickhanlonii]

Sure