feat(mongodb): set point_in_time_window_hours as required (#860)

* feat(mongodb): set point_in_time_window_hours as required

* docs update

docs/resources/mongodbflex_instance.md

@@ -19,7 +19,7 @@ resource "stackit_mongodbflex_instance" "example" {
   acl        = ["XXX.XXX.XXX.X/XX", "XX.XXX.XX.X/XX"]
   flavor = {
     cpu = 1
-    ram = 8
+    ram = 4
   }
   replicas = 1
   storage = {
@@ -28,8 +28,9 @@ resource "stackit_mongodbflex_instance" "example" {
   }
   version = "7.0"
   options = {
-    type                    = "Single"
-    snapshot_retention_days = 3
+    type                       = "Single"
+    snapshot_retention_days    = 3
+    point_in_time_window_hours = 30
   }
   backup_schedule = "0 0 * * *"
 }
@@ -74,13 +75,13 @@ Read-Only:
 
 Required:
 
+- `point_in_time_window_hours` (Number) The number of hours back in time the point-in-time recovery feature will be able to recover.
 - `type` (String) Type of the MongoDB Flex instance. Supported values are: `Replica`, `Sharded`, `Single`.
 
 Optional:
 
 - `daily_snapshot_retention_days` (Number) The number of days that daily backups will be retained.
 - `monthly_snapshot_retention_months` (Number) The number of months that monthly backups will be retained.
-- `point_in_time_window_hours` (Number) The number of hours back in time the point-in-time recovery feature will be able to recover.
 - `snapshot_retention_days` (Number) The number of days that continuous backups (controlled via the `backup_schedule`) will be retained.
 - `weekly_snapshot_retention_weeks` (Number) The number of weeks that weekly backups will be retained.