fix(docs): remove deprecated usage from drizzle adaptor sample code

[mst-mkt]

☕️ Reasoning

Fixed deprecated usage in the schema example of the Drizzle adapter documentation. - The method used was deprecated in drizzle-orm v0.36.0 (current version: v0.44.2). Drizzle ORM documentation now reflects the updated approach.

In that drizzle-orm update, there was a change in how the third argument is passed when defining indexes, composite primary keys, and similar constraints, as shown below.

  sqliteTable('users', {
      id: integer().primaryKey(),
- }, (t) => ({
-     index: index('test').on(t.id),
- }));
+ }, (t) => [
+     index('test').on(t.id)
+ ])

Also, #12285 addresses a similar update related to the drizzle-orm version, but in a different part of the documentation. It might be helpful to incorporate both changes.

🧢 Checklist

• Documentation
• Tests
• Ready to be merged

🎫 Affected issues

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

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