fix: update deprecated deleteSession usage in Next.js tutorial

[NairAlina]

What does this PR do?

Updates the deprecated usage of account.deleteSession('current') in the Next.js tutorial.
The Appwrite SDK now expects an object parameter, so the code has been updated to:
account.deleteSession({ sessionId: 'current' })

This ensures the tutorial follows the current SDK syntax and prevents confusion for developers following the guide.

Test Plan

Verified the change by checking the current Appwrite SDK documentation and confirming that deleteSession expects an object parameter.

Related PRs and Issues

Closes #2489

Have you read the Contributing Guidelines on issues?

Yes, I have read the contributing guidelines.

Summary by CodeRabbit

• Documentation
  • Updated Next.js tutorial documentation (step 4) to reflect the current logout flow implementation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1c61dd94-5991-4918-8b27-8748d87010d2

📥 Commits

Reviewing files that changed from the base of the PR and between 1f85115 and 6df0940.

📒 Files selected for processing (1)

• src/routes/docs/tutorials/nextjs/step-4/+page.markdoc

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Walkthrough

The change updates a documentation file for a Next.js tutorial step. The logout flow example is modified to invoke account.deleteSession with an object parameter { sessionId: 'current' } instead of passing a plain string 'current'. Additionally, two trailing newlines are added to the file for formatting consistency.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: updating deprecated deleteSession usage in the Next.js tutorial to match current SDK syntax.
Linked Issues check	✅ Passed	The PR successfully addresses issue #2489 by updating account.deleteSession('current') to account.deleteSession({ sessionId: 'current' }) as requested.
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing the deprecated deleteSession usage in the Next.js tutorial as specified in issue #2489; no out-of-scope modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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📝 Coding Plan

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