tidb-cloud: fix Terraform import ID formats for network container and private endpoint connection

[yahonda]

What is changed, added, or deleted? (Required)

Fixes the import ID formats in two Terraform resource docs. The documented formats do not match what the TiDB Cloud Terraform Provider accepts.

• tidb-cloud/terraform-use-dedicated-network-container-resource.md: the doc says to replace ${id} with cluster_id,network_container_id. The provider's ImportState passes the whole import ID through as network_container_id:

  func (r *DedicatedNetworkContainerResource) ImportState(ctx context.Context, req resource.ImportStateRequest, resp *resource.ImportStateResponse) {
  	resource.ImportStatePassthroughID(ctx, path.Root("network_container_id"), req, resp)
  }

  Read then calls GetNetworkContainer(ctx, data.NetworkContainerId.ValueString()), so an import ID that contains a cluster_id, prefix fails. The doc now says to use the network container ID.

• tidb-cloud/terraform-use-dedicated-private-endpoint-connection-resource.md: the doc says cluster_id,dedicated_private_endpoint_connection_id (two parts). The provider requires three parts and rejects anything else:

  idParts := strings.Split(req.ID, ",")
  if len(idParts) != 3 || idParts[0] == "" || idParts[1] == "" || idParts[2] == "" {
  	resp.Diagnostics.AddError(
  		"Unexpected Import Identifier",
  		fmt.Sprintf("Expected import identifier with format: cluster_id, node_group_id, private_endpoint_connection_id. Got: %q", req.ID),
  	)
  	return
  }

  The doc now says cluster_id,node_group_id,private_endpoint_connection_id.

Source: internal/provider/dedicated_network_container_resource.go and internal/provider/dedicated_private_endpoint_connection_resource.go in tidbcloud/terraform-provider-tidbcloud.

This was flagged by CodeRabbit on the Japanese translation PR #23987, which inherited the same formats from EN.

Update (73f9dd6): the terraform apply example outputs later in both sections still showed the old import IDs. They now use the corrected formats, with the ID values that already appear on the same pages:

• Network container: [id=10423692645683000000,example] → [id=1934235512696000000] (the network_container_id value).
• Private endpoint connection: [id=aws-1934187953894000000,example] (and aws-19341879538940000000 in the Import complete line, which also had a different digit count) → [id=10757937805044000000,1934178998036000000,1934214559409000000] (the cluster_id, node_group_id, and private_endpoint_connection_id values).

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

What is the related PR or file link(s)?

• Related code change PR links (if applicable): N/A
• This PR is translated from: N/A
• Other reference link(s): i18n(ja): fix dropped particles and garbled sentences in TiDB Cloud Terraform docs #23987

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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Reviewing files that changed from the base of the PR and between 2ea1beb and 73f9dd6.

📒 Files selected for processing (2)

• tidb-cloud/terraform-use-dedicated-network-container-resource.md
• tidb-cloud/terraform-use-dedicated-private-endpoint-connection-resource.md

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[qiancai]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-09-30 01:22:32.512107957 +0000 UTC m=+759077.737329065: ☑️ agreed by qiancai.

[qiancai]

The corrected import ID formats look right, but the example import outputs later in both sections still use the old/invalid formats. Could we update them as part of this PR as well? Otherwise, each section gives users two conflicting import ID formats.

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[yahonda]

Updated the output ids. 73f9dd6