Update README for airflow_pool module parameters and pool deletion

Author: VincentGoeckeritz

modules/airflow_pool/README.md

@@ -6,15 +6,20 @@ This optional module is used to create a Cloud Composer Pool.
 module "pool" {
   source      = "terraform-google-modules/composer/google//modules/airflow_pool"
 
-  project_id  = "project-123"
-  environment = "Composer-Prod-Env"
-  location    = "us-central1"
-  name        = "beta"
-  slots       = 1000
-  description = "Pool used by beta DAGs"
+  project           = "project-123"
+  environment       = "Composer-Prod-Env"
+  location          = "us-central1"
+  composer_env_name = "beta"
+  slot_count        = 1000
+  description       = "Pool used by beta DAGs"
 }
 ```
 
+> [!IMPORTANT]
+> to delete a pool you first need to run
+> ``` terraform destroy --target module.however_you_named_it ```
+> if you just remove the module configuration from your code the pool will not be deleted.
+
 ```
 <!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
 ## Inputs
@@ -24,9 +29,10 @@ module "pool" {
 | composer\_env\_name | Name of the Cloud Composer Environment. | `string` | n/a | yes |
 | description | The description of the pool | `string` | `"Managed by Terraform"` | no |
 | pool\_name | The name of the pool | `string` | n/a | yes |
-| project\_id | Project ID where Cloud Composer Environment is created. | `string` | n/a | yes |
+| project | Project name where Cloud Composer Environment is created. | `string` | n/a | yes |
 | region | Region where the Cloud Composer Environment is created. | `string` | n/a | yes |
 | slot\_count | The number of slots in this pool | `number` | n/a | yes |
+| include_deferred | Whether the pool should include deferred tasks in its calculation of occupied slots | `bool` | false | no |
 
 ## Outputs