better-sqlite3 all examples wrong

The very first page of using better-sqlite3 is all wrong.

https://orm.drizzle.team/docs/get-started-sqlite#better-sqlite3

```
import { drizzle } from 'drizzle-orm/better-sqlite3';

const db = drizzle(process.env.DATABASE_URL);

const result = await db.execute('select 1');
```

`db.execute` doesn't exist.

`db.$client.exec('SELECT 1')` exists.