`DOCKER_HOST` without `unix://` prefix prints a confusing error: `Cannot connect to the Docker daemon at tcp://localhost:2375/foo.sock.`

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Description

$ DOCKER_HOST=/invalid.sock docker version
Client:
 Version:           27.5.1
 API version:       1.47
 Go version:        go1.22.11
 Git commit:        9f9e405
 Built:             Wed Jan 22 13:39:08 2025
 OS/Arch:           linux/arm64
 Context:           default
Cannot connect to the Docker daemon at tcp://localhost:2375/invalid.sock. Is the docker daemon running?

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