Add possible values for the OS argument of ibm_container_vpc_cluster

[lionelmace]

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New or Affected Resource(s) or Datasource(s)

• ibm_container_vpc_cluster

https://registry.terraform.io/providers/IBM-Cloud/ibm/latest/docs/resources/container_vpc_cluster

Description

The argument [operating_system](https://registry.terraform.io/providers/IBM-Cloud/ibm/latest/docs/resources/container_vpc_cluster#operating_system) should mention the potential values REDHAT_8_64 or RHCOS