r/aws_neptune_cluster: discourage automated snapshots for snapshot_id…

…entifier

website/docs/r/neptune_cluster.html.markdown

@@ -62,7 +62,7 @@ The following arguments are supported:
 * `port` - (Optional) The port on which the Neptune accepts connections. Default is `8182`.
 * `replication_source_identifier` - (Optional) ARN of a source Neptune cluster or Neptune instance if this Neptune cluster is to be created as a Read Replica.
 * `skip_final_snapshot` - (Optional) Determines whether a final Neptune snapshot is created before the Neptune cluster is deleted. If true is specified, no Neptune snapshot is created. If false is specified, a Neptune snapshot is created before the Neptune cluster is deleted, using the value from `final_snapshot_identifier`. Default is `false`.
-* `snapshot_identifier` - (Optional) Specifies whether or not to create this cluster from a snapshot. You can use either the name or ARN when specifying a Neptune cluster snapshot, or the ARN when specifying a Neptune snapshot.
+* `snapshot_identifier` - (Optional) Specifies whether or not to create this cluster from a snapshot. You can use either the name or ARN when specifying a Neptune cluster snapshot, or the ARN when specifying a Neptune snapshot. Automated snapshots **should not** be used for this attribute, unless from a different cluster. Automated snapshots are deleted as part of cluster destruction when the resource is replaced.
 * `storage_encrypted` - (Optional) Specifies whether the Neptune cluster is encrypted. The default is `false` if not specified.
 * `tags` - (Optional) A map of tags to assign to the Neptune cluster. If configured with a provider [`default_tags` configuration block](https://registry.terraform.io/providers/hashicorp/aws/latest/docs#default_tags-configuration-block) present, tags with matching keys will overwrite those defined at the provider-level.
 * `vpc_security_group_ids` - (Optional) List of VPC security groups to associate with the Cluster