What is the use of “docker update” commands? with example and image

Used to change container configurations.

To update restart policy

docker update --restart=always 5337b0dc70e87be6c87309004abbc9eff8227a6b4c95cdf5a1b788bf96c6fb70

Before:
"RestartPolicy": {
                "Name": "always",
                "MaximumRetryCount": 0
            },


After:
"RestartPolicy": {
                "Name": "always",
                "MaximumRetryCount": 0
            },