Use correct path when checking if DAGs.md needs to be regenerated

[AetherUnbound]

Description

Follow up from #3696, we identified that the DAG documentation generation CI check was no longer appropriately failing when it should have. This PR corrects the path used to reference the DAGs file and updates the DAG documentation appropriately.

Testing Instructions

1. Make a change to the DAGs.md file
2. Run j catalog/generate-dag-docs true and ensure that the task fails

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (if applicable).

Developer Certificate of Origin

Developer Certificate of Origin

Developer Certificate of Origin
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Everyone is permitted to copy and distribute verbatim copies of this
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Developer's Certificate of Origin 1.1

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(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
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    in the file; or

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    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/3697

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Changed files 🔄:

• https://docs.openverse.org/_preview/3697/catalog/reference/DAGs.html

[krysal]

Thanks!

[stacimc]

🚀