Correct documentation for disable_on_destroy default breaking change (#15014)

Author: c2thorn

mmv1/third_party/terraform/website/docs/guides/version_7_upgrade.html.markdown

@@ -241,11 +241,20 @@ This resource is not functional and can safely be removed from your configuratio
 
 ## Resource: `google_project_service`
 
-### `disable_on_destroy` now defaults to `false`
+### `disable_on_destroy` no longer defaults to `true`
 
-The default value for `disable_on_destroy` has been changed to `false`. The previous default (`true`) created a risk of unintended service disruptions, as destroying a single `google_project_service` resource would disable the API for the entire project.
+The default value for `disable_on_destroy` has been removed. The previous default (`true`) created a risk of unintended service disruptions, as destroying a single `google_project_service` resource would disable the API for the entire project.
 
-Now, destroying the resource will only remove it from Terraform's state and leave the service enabled. To disable a service when the resource is destroyed, you must now make an explicit decision by setting `disable_on_destroy = true`.
+Now, destroying the resource will only remove it from Terraform's state and leave the service enabled. For resources that did not explicitly have `disable_on_destroy` set, users will see a diff similar to the following:
+
+```hcl
+  ~ resource "google_project_service" "main" {
+      - disable_on_destroy                    = true -> null
+```
+
+Applying this change is the same as setting the value to `false`. Terraform will not make any additional API requests or change the project service enablement. It will only affect any future removal of this resource.
+
+To enable the previous default behavior, you must now make an explicit decision by setting `disable_on_destroy = true`.
 
 ## Resource: `google_redis_cluster`
 

mmv1/third_party/terraform/website/docs/r/google_project_service.html.markdown

@@ -45,9 +45,9 @@ The following arguments are supported:
 * `project` - (Optional) The project ID. If not provided, the provider project
 is used.
 
-* `disable_on_destroy` - (Optional) If `true` or unset, disable the service when the
-Terraform resource is destroyed. If `false`, the service will be left enabled when
-the Terraform resource is destroyed. Defaults to `false`. It should generally only 
+* `disable_on_destroy` - (Optional) If `true`, disable the service when the
+Terraform resource is destroyed. If `false` or unset, the service will be left enabled when
+the Terraform resource is destroyed. It should generally only 
 be `true` or unset in configurations that manage the `google_project` resource itself.
 
 * `disable_dependent_services` - (Optional) If `true`, services that are enabled
@@ -59,7 +59,6 @@ services depend on this service when attempting to destroy it.
 [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html)
 If `true`, the usage of the service to be disabled will be checked and an error
 will be returned if the service to be disabled has usage in last 30 days.
-Defaults to `false`.
 
 ## Attributes Reference