[editorial] Adjust link into in-toto attestation spec (#1753)

Co-authored-by: Joao Grassi <[email protected]>

docs/attributes-registry/artifact.md

@@ -13,7 +13,7 @@ This group describes attributes specific to artifacts. Artifacts are files or ot
 | Attribute | Type | Description | Examples | Stability |
 |---|---|---|---|---|
 | <a id="artifact-attestation-filename" href="#artifact-attestation-filename">`artifact.attestation.filename`</a> | string | The provenance filename of the built attestation which directly relates to the build artifact filename. This filename SHOULD accompany the artifact at publish time. See the [SLSA Relationship](https://slsa.dev/spec/v1.0/distributing-provenance#relationship-between-artifacts-and-attestations) specification for more information. | `golang-binary-amd64-v0.1.0.attestation`; `docker-image-amd64-v0.1.0.intoto.json1`; `release-1.tar.gz.attestation`; `file-name-package.tar.gz.intoto.json1` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
-| <a id="artifact-attestation-hash" href="#artifact-attestation-hash">`artifact.attestation.hash`</a> | string | The full [hash value (see glossary)](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-5.pdf), of the built attestation. Some envelopes in the software attestation space also refer to this as the [digest](https://github.com/in-toto/attestation/blob/main/spec/README.md#in-toto-attestation-framework-spec). | `1b31dfcd5b7f9267bf2ff47651df1cfb9147b9e4df1f335accf65b4cda498408` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+| <a id="artifact-attestation-hash" href="#artifact-attestation-hash">`artifact.attestation.hash`</a> | string | The full [hash value (see glossary)](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-5.pdf), of the built attestation. Some envelopes in the [software attestation space](https://github.com/in-toto/attestation/tree/main/spec) also refer to this as the **digest**. | `1b31dfcd5b7f9267bf2ff47651df1cfb9147b9e4df1f335accf65b4cda498408` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
 | <a id="artifact-attestation-id" href="#artifact-attestation-id">`artifact.attestation.id`</a> | string | The id of the build [software attestation](https://slsa.dev/attestation-model). | `123` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
 | <a id="artifact-filename" href="#artifact-filename">`artifact.filename`</a> | string | The human readable file name of the artifact, typically generated during build and release processes. Often includes the package name and version in the file name. [1] | `golang-binary-amd64-v0.1.0`; `docker-image-amd64-v0.1.0`; `release-1.tar.gz`; `file-name-package.tar.gz` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
 | <a id="artifact-hash" href="#artifact-hash">`artifact.hash`</a> | string | The full [hash value (see glossary)](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-5.pdf), often found in checksum.txt on a release of the artifact and used to verify package integrity. [2] | `9ff4c52759e2c4ac70b7d517bc7fcdc1cda631ca0045271ddd1b192544f8a3e9` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |

model/artifact/registry.yaml

@@ -91,7 +91,7 @@ groups:
         stability: experimental
         brief: >
           The full [hash value (see glossary)](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-5.pdf),
-          of the built attestation. Some envelopes in the software attestation
-          space also refer to this as the [digest](https://github.com/in-toto/attestation/blob/main/spec/README.md#in-toto-attestation-framework-spec).
+          of the built attestation. Some envelopes in the [software attestation
+          space](https://github.com/in-toto/attestation/tree/main/spec) also refer to this as the **digest**.
         examples:
           ["1b31dfcd5b7f9267bf2ff47651df1cfb9147b9e4df1f335accf65b4cda498408"]