chore(docs): fix external-dns routing policies link

[catmand00]

Issue

Description

Old link is not working: https://kubernetes-sigs.github.io/external-dns/latest/tutorials/aws/#routing-policies

Needs an extra /docs/ in the URL: https://kubernetes-sigs.github.io/external-dns/latest/docs/tutorials/aws/#routing-policies

Checklist

• [ ] Added tests that cover your change (if possible)
• [x] Added/modified documentation as required (such as the README.md, or the docs directory)
• [x] Manually tested
• [x] Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! :exploding_head:

• [ ] Backfilled missing tests for code in same general area :tada:
• [ ] Refactored something and made the world a better place :star2: