code: func ParseSupportedVersions(s string) (SupportedVersions, error) {
  	var err error
  	list := strings.Split(s, ",")
  	versions := make(SupportedVersions, len(list))
  	for i, v := range list {
  		versions[i], err = ParseEtcdVersion(strings.TrimSpace(v))
  		if err != nil {
  			return nil, err
  		}
  	}
  	return versions, nil
  }
docs: // ParseSupportedVersions parses a comma separated list of etcd versions.