[editorial] Invalid / retired link into Docker spec

[chalin]

The reference https://docs.docker.com/registry/spec/manifest-v2-2/#example-image-manifest is to a "retired" concept:

$ curl -sI https://docs.docker.com/registry/spec/manifest-v2-2/#example-image-manifest | grep -Ee '^(HTTP|loc)' 
HTTP/2 301 
location: /retired/

Here is where it occurs in the docs:

content-modules/semantic-conventions/docs/attributes-registry/oci.md:
  14  **[1] `oci.manifest.digest`:** Follows [OCI Image Manifest Specification](https://github.com/opencontainers/image-spec/blob/main/manifest.md), and specifically the [Digest property](https://github.com/opencontainers/image-spec/blob/main/descriptor.md#digests).
  15: An example can be found in [Example Image Manifest](https://docs.docker.com/registry/spec/manifest-v2-2/#example-image-manifest).
  16  

content-modules/semantic-conventions/docs/resource/container.md:
  38  **[3] `oci.manifest.digest`:** Follows [OCI Image Manifest Specification](https://github.com/opencontainers/image-spec/blob/main/manifest.md), and specifically the [Digest property](https://github.com/opencontainers/image-spec/blob/main/descriptor.md#digests).
  39: An example can be found in [Example Image Manifest](https://docs.docker.com/registry/spec/manifest-v2-2/#example-image-manifest).
  40  

content-modules/semantic-conventions/model/oci/registry.yaml:
  20            An example can be found in
  21:           [Example Image Manifest](https://docs.docker.com/registry/spec/manifest-v2-2/#example-image-manifest).
  22          examples: [ 'sha256:e4ca62c0d62f3e886e684806dfe9d4e0cda60d54986898173c1083856cfda0f4' ]

static/refcache.json:
  1105    },
  1106:   "https://docs.docker.com/registry/spec/manifest-v2-2/#example-image-manifest": {
  1107      "StatusCode": 206,

What should this link be replaced by? Ideally a link that has HTTP status 200, not 301.

This issue is reported in the scope of:

• [chore] Ensure that external link fragments are valid opentelemetry.io#6196

[trask]

I'd suggest https://github.com/opencontainers/image-spec/blob/main/manifest.md#example-image-manifest