Use values from documentation for validation

[AlekSi]

Our docgen tool allows us to document valid values like that:

    //   values:
    //     - "init"
    //     - "controlplane"
    //     - "worker"
    MachineType string `yaml:"type"`

Those values are accumulated there:

// Doc represents a struct documentation rendered from comments by docgen.
type Doc struct {
    // Values is only used to render valid values list in the documentation.
    Values []string

I wonder if we could use those values not only in the documentation but also in config validation.

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