Fix doc: broken link to hydra specialization

[chenzizhao]

Pull Request

This template outlines which information should be contained in a pull request description. Please adhere to this structure as closely as possible and ensure that you can check off every box in the checklist. If have any questions or are unsure, ask - we're happy to help!

• Motivation behind this PR. What problem does it solve? Fix broken link
• Include the link to the corresponding issue(s). N/A

Changes

• A clear and concise description of the included changes. Fix broken link to hydra specialization
• Type(s) of changes. Options (multiple choice, use [x] where appropriate):
  • [ ] New feature.
  • [ ] Bug-fix.
  • [x] Documentation.
  • [ ] Breaking change.

Checklist:

I have ...

• [x] ...read the contribution guidelines.
• [ ] ...created an issue prior to opening this pull request.
• [ ] ...verified that pytest test passes successfully.
• [ ] ...added at least one test that checks whether my changes work as intended.
• [x] ...updated the documentation where reasonable.
• [ ] ...verified that the documentation can be built (if changes to the documentation were made).