[Doc] Fix Supabase API handler example in NextJS tutorial

[Ariyn]

Official supabase document describes to add Authorization token. document

Problem

I could not update supabase rows after follow this nextjs integration example.

Turns out I need to add authorization token too, when RLS is set.

Solution

Describe the solution this PR implements

How To Test

Describe the steps required to test the changes

Additional Checks

• The PR targets master for a bugfix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
  Document fix
• The PR includes one or several stories (if not possible, describe why)
  Document fix
• The documentation is up to date

Also, please make sure to read the contributing guidelines.

[slax57]

Thank you for this contribution.
This PR doesn't need to target next, as it is not a new feature, but fixes an issue in the docs. Can you please rebase it to target the master branch instead?
Thank you.

[Ariyn]

I changed. Thank you for kind introduce. :)

[slax57]

Thanks!