Add example to docker image inspect documentation

The docker image inspect command shows a lot useful information on a Docker image. However, I am missing an explained example on what all the entries shown in the response actually mean. The current documentation makes no statement about this. I could also not find a single reference outside Docker docs. Some information can be inferred from the OCI Image Specification, others from the Docker run reference. But not all entries are explained sufficiently.

I created this issue as generalization of issue #16315

As an example, pull the latest nginx image and execute docker image inspect nginx, you will get this output:

[
    {
        "Id": "sha256:ac8efec875ce36b619cb41f91d9db579487b9d45ed29393dc957a745b1e0024f",
        "RepoTags": [
            "nginx:1.23.2",
            "nginx:latest"
        ],
        "RepoDigests": [
            "nginx@sha256:ab589a3c466e347b1c0573be23356676df90cd7ce2dbf6ec332a5f0a8b5e59db"
        ],
        "Parent": "",
        "Comment": "",
        "Created": "2022-12-06T04:46:58.320356931Z",
        "Container": "3171a476b89e47a3d602688a3d1ada78b93cc52caf218265481d9c91ca5ebcdf",
        "ContainerConfig": {
            "Hostname": "3171a476b89e",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "80/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "NGINX_VERSION=1.23.2",
                "NJS_VERSION=0.7.7",
                "PKG_RELEASE=1~bullseye"
            ],
            "Cmd": [
                "/bin/sh",
                "-c",
                "#(nop) ",
                "CMD [\"nginx\" \"-g\" \"daemon off;\"]"
            ],
            "Image": "sha256:19d855ece39b9e1bf1a9126ed89c7931f8505a2f4e5893f3c72d9b8b310b671f",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": [
                "/docker-entrypoint.sh"
            ],
            "OnBuild": null,
            "Labels": {
                "maintainer": "NGINX Docker Maintainers <docker-maint@nginx.com>"
            },
            "StopSignal": "SIGQUIT"
        },
        "DockerVersion": "20.10.12",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "80/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "NGINX_VERSION=1.23.2",
                "NJS_VERSION=0.7.7",
                "PKG_RELEASE=1~bullseye"
            ],
            "Cmd": [
                "nginx",
                "-g",
                "daemon off;"
            ],
            "Image": "sha256:19d855ece39b9e1bf1a9126ed89c7931f8505a2f4e5893f3c72d9b8b310b671f",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": [
                "/docker-entrypoint.sh"
            ],
            "OnBuild": null,
            "Labels": {
                "maintainer": "NGINX Docker Maintainers <docker-maint@nginx.com>"
            },
            "StopSignal": "SIGQUIT"
        },
        "Architecture": "amd64",
        "Os": "linux",
        "Size": 141767578,
        "VirtualSize": 141767578,
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/872573049e3bf097fad7dee192afe78bb2c42524eb429602ae088c453652d4b2/diff:/var/lib/docker/overlay2/b08669580851d90170f32fe614a7f1c0ce1e0045eff1c2318ab55fdc5a05c34f/diff:/var/lib/docker/overlay2/47cac3f836efd18d9110de151f0a2badeb74e804313b932a18b68a03a4faf549/diff:/var/lib/docker/overlay2/63900275913ee385755ebf0115d152dc0192c49b5c5f5a910ae2c6d0f4a35803/diff:/var/lib/docker/overlay2/42a97c895a2607143d490cc67fab2c203c5b424ec98d7644c87052abf0710b32/diff",
                "MergedDir": "/var/lib/docker/overlay2/ac6162282cab60993f833557a2ec9ae20842015ec30c5c79ad95ae99dd5dcdf1/merged",
                "UpperDir": "/var/lib/docker/overlay2/ac6162282cab60993f833557a2ec9ae20842015ec30c5c79ad95ae99dd5dcdf1/diff",
                "WorkDir": "/var/lib/docker/overlay2/ac6162282cab60993f833557a2ec9ae20842015ec30c5c79ad95ae99dd5dcdf1/work"
            },
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:b5ebffba54d3e3f7fd80435fcdc34c4a96fdb2ecab0f0a298fe08f74c2f69d29",
                "sha256:2842e5d66803d5141f310218e017d24983fa8c05936c12471ba8f87451720035",
                "sha256:f88642d922a1d9af61581afab6afa968e139763f003c047ae0a7bd3b40f00392",
                "sha256:6906edffc609cbf0ddcde6528af25a4b6c187c219af4e484363bb392849a89a2",
                "sha256:aa3739f310f5e93f7519ce69e7248fd3bba426b9e7ad730d623bda63b45e8802",
                "sha256:7b72d5d921cb3acfc32df62534c75e4dbe7a14c98297c6657ae82b78ce608669"
            ]
        },
        "Metadata": {
            "LastTagTime": "0001-01-01T00:00:00Z"
        }
    }
]

Here, as an example, it is unclear to me what exactly StdInOnce means. Others are obviously self-explaining, however, I would suggest that an exemplary interpretation on what these entries mean, would help a lot.

Start with the current docker image inspect documentation and run docker image inspect nginx to review the example output. Compare each field with the OCI Image Specification and Docker run reference, especially entries such as StdInOnce. Done means the documentation includes an explained example that defines the output entries sufficiently for users to interpret them.