Updated code snippets in Next.js

[ishachopra0401]

What do these changes do?

Describe the changes you are proposing in this PR.

Type of documentation

• [ ] New documentation
• [ ] Documentation update
• [ ] Hotfix

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Name	Status	Preview	Comments	Updated
rudderstack-docs	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 8, 2023 at 10:40AM (UTC)