Migrate hand crafted documentation to auto generated tfplugindocs

[ddelnano]

The hashicorp/terraform-plugin-docs makes it easy to define your terraform provider's documentation inline with the resource and data source code. The newer resources such as xenorchestra_network and xenorchestra_bonded_network were created with this already, but all of the existing resources and data sources must be migrated to it.

The following list tracks the remaining work to complete this migration:

• xenorchestra_vm
• xenorchestra_vdi
• xenorchestra_acl
• xenorchestra_cloud_config
• data source vms
• data source vdi
• data source user
• data source template
• data source sr
• data source resource_set
• data source pool
• data source pif
• data source network
• data source hosts
• data source host
• data source cloud_config

[ddelnano]

The next release of the provider will include the majority of the migration. The vm resource and data source are blocked behind the migration to the terraform-plugin-framework due to hashicorp/terraform-plugin-docs#64 (comment).