docs: Region mismatch

[AdityaKK0407]

Area of Improvement

The default region for uploading is set to Portland (pdx1) but in the documentation page, the default region mentioned is Seattle (sea1).

Link to related docs

https://docs.uploadthing.com/concepts/regions-acl#region

Additional information

No response

👨‍👧‍👦 Contributing

• 🙋‍♂️ Yes, I'd be down to file a PR implementing the suggested changes!