Fix/stackittpr 102 objectstorage handling region in individual resources (#711)

* Revert "fix: make resource/data-source specific region attribute read-only (#682)"

This reverts commit 3e8dcc542b.

* fix: Support individual regions

* fix: review findings

docs/data-sources/objectstorage_bucket.md

@@ -26,6 +26,9 @@ data "stackit_objectstorage_bucket" "example" {
 
 - `name` (String) The bucket name. It must be DNS conform.
 - `project_id` (String) STACKIT Project ID to which the bucket is associated.
+
+### Optional
+
 - `region` (String) The resource region. If not defined, the provider region is used.
 
 ### Read-Only

docs/data-sources/objectstorage_credential.md

@@ -28,6 +28,9 @@ data "stackit_objectstorage_credentials_group" "example" {
 - `credential_id` (String) The credential ID.
 - `credentials_group_id` (String) The credential group ID.
 - `project_id` (String) STACKIT Project ID to which the credential group is associated.
+
+### Optional
+
 - `region` (String) The resource region. If not defined, the provider region is used.
 
 ### Read-Only

docs/data-sources/objectstorage_credentials_group.md

@@ -25,12 +25,12 @@ data "stackit_objectstorage_credentials_group" "example" {
 ### Required
 
 - `project_id` (String) Object Storage Project ID to which the credentials group is associated.
-- `region` (String) The resource region. If not defined, the provider region is used.
 
 ### Optional
 
 - `credentials_group_id` (String) The credentials group ID.
 - `name` (String) The credentials group's display name.
+- `region` (String) The resource region. If not defined, the provider region is used.
 
 ### Read-Only