Update per opencontainers/artifacts#29

Signed-off-by: Aviral Takkar <[email protected]>

Author: aviral26

docs/distribution/prototype-example.md

@@ -70,7 +70,7 @@ manifestDigest="sha256:$(sha256sum $manifestFile | cut -d " " -f 1)" && \
 
 ```shell
 artifactFile="artifact.json" && \
-  artifactMediaType="application/vnd.oci.artifact.manifest.v1+json" && \
+  artifactMediaType="application/vnd.oci.artifact.manifest.v1-rc1+json" && \
   artifactType="application/vnd.cncf.notary.v2" && \
   signatureMediaType="application/vnd.cncf.notary.signature.v2+jwt" && \
   signatureFileSize=`wc -c < $signatureFile` && \
@@ -79,7 +79,7 @@ artifactFile="artifact.json" && \
 
 cat <<EOF > $artifactFile
 {
-  "schemaVersion": 2,
+  "schemaVersion": 3,
   "mediaType": "$artifactMediaType",
   "artifactType": "$artifactType",
   "blobs": [
@@ -89,13 +89,11 @@ cat <<EOF > $artifactFile
       "size": $signatureFileSize
     }
   ],
-  "manifests": [
-    {
+  "subjectManifest": {
       "mediaType": "$manifestMediaType",
       "digest": "$manifestDigest",
       "size": $manifestFileSize
-    }
-  ]
+  }
 }
 EOF
 ```
@@ -123,14 +121,14 @@ curl -X PUT --data-binary @"$artifactFile" -H "Content-Type: $artifactMediaType"
 
 ```shell
 # Retrieve linked artifacts
-curl -s "http://$registry/v2/_ext/oci-artifacts/v1/$repo/manifests/$manifestDigest/references?artifact-type=$artifactType" | jq
+curl -s "http://$registry/v2/_ext/oci-artifacts/v1-rc1/$repo/manifests/$manifestDigest/referrers?referenceType=$artifactType" | jq
 ```
 
 ### Verify signature
 
 ```shell
 # Retrieve signature digest from first artifact.
-signatureDigest=`curl -s "http://$registry/v2/_ext/oci-artifacts/v1/$repo/manifests/$manifestDigest/references?artifact-type=$artifactType" | jq -r '.references[0].manifest.blobs[0].digest'` && \
+signatureDigest=`curl -s "http://$registry/v2/_ext/oci-artifacts/v1-rc1/$repo/manifests/$manifestDigest/referrers?referenceType=$artifactType" | jq -r '.references[0].manifest.blobs[0].digest'` && \
   retrievedSignatureFile="retrieved-signature.json" && \
   curl -s http://$registry/v2/$repo/blobs/$signatureDigest > $retrievedSignatureFile