docs: include disble monitoring in cloudrun changes

docs/explanations/gcp-cloud-run-app-module.md

@@ -97,13 +97,15 @@ https://gitlab.developers.cam.ac.uk/uis/devops/infra/terraform/gcp-cloud-run-app
   ```
 
 - `sql_instance_connection_name`: has been changed to `mount_cloudsql_instance`.
+- `disable_monitoring`: has been renamed to `enable_monitoring` and the new default behaviour is to
+   disable monitoring.
 - `environment_variables`: now this variable is not declared at the top level. Instead, each
   container in `containers` map has an `env` key with a list of maps (see example above).
 - `allowed_ingress`: changed to `ingress`. The ingress setting for the Cloud Run service.
   Possible values are `INGRESS_TRAFFIC_ALL`, `INGRESS_TRAFFIC_INTERNAL_ONLY`, and
   `INGRESS_TRAFFIC_INTERNAL_LOAD_BALANCER`. If variable `use_load_balancer` is set to `true`,
   the provided `ingress` value will be ignored and the ingress will be set automatically to
-  `INGRESS_TRAFFIC_INTERNAL_LOAD_BALANCER``.
+  `INGRESS_TRAFFIC_INTERNAL_LOAD_BALANCER`.
 - `alert_notification_channels`: has been changed to `alerting_notification_channels`.
 
 ### Deleted features

docs/howtos/migrate-a-gcp-cloud-run-app-terraform-deployment-to-v9.md

@@ -135,12 +135,22 @@ In the example code mentioned above we need to update the following options:
     }
     ```
 
-- `sql_instance_connection_name`: this variable in now renamed to `mount_cloudsql_instance`:
+- `sql_instance_connection_name`: has been renamed to `mount_cloudsql_instance`:
 
     ```tf
     mount_cloudsql_instance = module.sql_instance.instance_connection_name
     ```
 
+- `disable_monitoring`: has been renamed to `enable_monitoring` and the new default behaviour is to
+    disable monitoring.
+
+    ```tf
+    enable_monitoring = true
+    ```
+
+For a full list of the changes to input variables refer to the [explanation
+page](../explanations/gcp-cloud-run-app-module.md).
+
 ### Adapt other changes
 
 If the project has the load balancer configured, use the `moved` blocks as shown in the
@@ -200,3 +210,4 @@ as the Cloud Run apps will be recreated (as well as a subset of auxiliary terraf
 ## Useful links
 
 - [More examples in the module's GitLab project](https://gitlab.developers.cam.ac.uk/uis/devops/infra/terraform/gcp-cloud-run-app/-/blob/master/docs/examples.md)
+- [Migrating to Google Cloud Run App Terraform module v9.0.0](../explanations/gcp-cloud-run-app-module.md)