fix: add missing docs

docs/data-sources/postgresflexalpha_instance.md

@@ -0,0 +1,86 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackitprivatepreview_postgresflexalpha_instance Data Source - stackitprivatepreview"
+subcategory: ""
+description: |-
+  Postgres Flex instance data source schema. Must have a region specified in the provider configuration.
+---
+
+# stackitprivatepreview_postgresflexalpha_instance (Data Source)
+
+Postgres Flex instance data source schema. Must have a `region` specified in the provider configuration.
+
+## Example Usage
+
+```terraform
+data "stackitprivatepreview_postgresflexalpha_instance" "example" {
+  project_id  = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  instance_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `instance_id` (String) ID of the PostgresFlex instance.
+- `project_id` (String) STACKIT project ID to which the instance is associated.
+
+### Optional
+
+- `region` (String) The resource region. If not defined, the provider region is used.
+
+### Read-Only
+
+- `backup_schedule` (String)
+- `encryption` (Attributes) (see [below for nested schema](#nestedatt--encryption))
+- `flavor` (Attributes) (see [below for nested schema](#nestedatt--flavor))
+- `id` (String) Terraform's internal data source. ID. It is structured as "`project_id`,`region`,`instance_id`".
+- `name` (String) Instance name.
+- `network` (Attributes) (see [below for nested schema](#nestedatt--network))
+- `replicas` (Number)
+- `storage` (Attributes) (see [below for nested schema](#nestedatt--storage))
+- `version` (String)
+
+<a id="nestedatt--encryption"></a>
+### Nested Schema for `encryption`
+
+Read-Only:
+
+- `key_id` (String)
+- `key_version` (String)
+- `keyring_id` (String)
+- `service_account` (String)
+
+
+<a id="nestedatt--flavor"></a>
+### Nested Schema for `flavor`
+
+Read-Only:
+
+- `cpu` (Number)
+- `description` (String)
+- `id` (String)
+- `node_type` (String)
+- `ram` (Number)
+
+
+<a id="nestedatt--network"></a>
+### Nested Schema for `network`
+
+Read-Only:
+
+- `access_scope` (String)
+- `acl` (List of String) The Access Control List (ACL) for the PostgresFlex instance.
+- `instance_address` (String)
+- `router_address` (String)
+
+
+<a id="nestedatt--storage"></a>
+### Nested Schema for `storage`
+
+Read-Only:
+
+- `class` (String)
+- `size` (Number)