Fix malformed markdown code block in document-internationalization README

[Copilot]

The README contained a malformed code block using 4 backticks with an ## Install heading incorrectly embedded inside it, breaking markdown rendering.

Changes:

• Fixed code block formatting: changed 4 backticks to proper 3-backtick bash code block for migration command
• Relocated ## Install section from inside code block to correct position between Upgrade and Usage sections
• Install section now renders properly as standalone heading per document structure

Before:

pnpm sanity migration run migrateToLanguageField --dry-run=false

Install

npm install --save @sanity/document-internationalization

**After:**
```markdown
```bash
pnpm sanity migration run migrateToLanguageField --dry-run=false

4. Update your GROQ queries

...

Install

npm install --save @sanity/document-internationalization

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Latest commit: 89ac722

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Project	Deployment	Actions	Updated (UTC)
plugins-studio	Ready	Preview, Comment	Feb 17, 2026 6:38pm