Add example and update docs

docs/data-sources/organization.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "astronomer_organization Data Source - terraform-provider-astronomer"
+subcategory: ""
+description: |-
+  Astronomer Organization Resource
+---
+
+# astronomer_organization (Data Source)
+
+Astronomer Organization Resource
+
+## Example Usage
+
+```terraform
+data "astronomer_organization" "test" {
+  id = "abc123" # org id. 
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `id` (String) Organization's unique identifier
+
+### Optional
+
+- `payment_method` (String) Payment method (if set)
+
+### Read-Only
+
+- `billing_email` (String) Billing email on file for the organization.
+- `created_at` (String) Timestamped string of when this organization was created
+- `is_scim_enabled` (Boolean) Whether or not scim is enabled
+- `managed_domains` (Attributes List) List of managed domains (nested) (see [below for nested schema](#nestedatt--managed_domains))
+- `name` (String) Organization's name
+- `product` (String) Type of astro product (e.g. hosted or hybrid)
+- `status` (String) Status of the organization
+- `support_plan` (String) Type of support plan the organization has
+- `trial_expires_at` (String) When the trial expires, if organization is in a trial
+- `updated_at` (String) Last time the organization was updated
+
+<a id="nestedatt--managed_domains"></a>
+### Nested Schema for `managed_domains`
+
+Required:
+
+- `created_at` (String)
+
+Read-Only:
+
+- `enforced_logins` (List of String)
+- `id` (Boolean)
+- `name` (String)
+- `status` (String)
+- `updated_at` (String)

examples/data-sources/astronomer_organization/data-source.tf

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+data "astronomer_organization" "test" {
+  id = "abc123" # org id. 
+}