fix: JWT documentation link to point to the correct resource

[7riatsu]

The previous link in the documentation led to a page unrelated to JWT.
Updated the URL to https://www.ory.sh/docs/oauth2-oidc/jwt-access-token, which provides proper JWT guidance.

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[7riatsu]

This PR updates the JWT documentation link to direct users to the correct resource, ensuring accurate information access.
I believe this enhances the user experience. Could this be reviewed at your earliest convenience?
If there are any issues or further adjustments needed, please advise.

[alnr]

Thanks!