[docs-scanner] Broken cross-reference to attestation-storage.md

[docker-agent]

File: content/manuals/build/metadata/attestations/_index.md

Issue

The page references a non-existent file:

To deep-dive into the specifics about how attestations are stored, see
Image Attestation Storage (BuildKit).

The file attestation-storage.md does not exist in the content/manuals/build/metadata/attestations/ directory or anywhere else in the repository.

Why this matters

Readers who want to learn more about attestation storage details will click this link and encounter a 404 error, breaking their learning flow and undermining trust in the documentation.

Suggested fix

Either:

1. Create the missing attestation-storage.md file with the detailed storage information, or
2. Remove this reference if the detailed storage information is not available, or
3. Link to an existing resource that covers attestation storage (such as BuildKit documentation)

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Found by nightly documentation quality scanner

[dvdksn]

Closing: the attestations content is vendored from an upstream repo (as configured in hugo.yaml). Changes to cross-references like this must go to the source repository, not docker/docs directly.