Update known_issues.mdx

removing bullet point as there is only one issue.

product_docs/docs/postgres_distributed_for_kubernetes/1/known_issues.mdx

@@ -6,16 +6,16 @@ This is a currently known issue in EDB Postgres Distributed for Kubernetes.
 
 ## Backup
 
--   To configure an EDB Postgres Distributed for Kubernetes environment, you must apply a `Cluster` YAML object to each Kubernetes cluster, 
-    which then creates all necessary services for the implementation of a distributed architecture. 
+To configure an EDB Postgres Distributed for Kubernetes environment, you must apply a `Cluster` YAML object to each Kubernetes cluster, 
+which then creates all necessary services for the implementation of a distributed architecture. 
 
-    If you have added a `spec.backup` section to this `Cluster` object with the goal of setting up a backup configuration, the backup will fail 
-    unless you also set the `spec.backup.cron.schedule` value. 
+If you have added a `spec.backup` section to this `Cluster` object with the goal of setting up a backup configuration, the backup will fail 
+unless you also set the `spec.backup.cron.schedule` value. 
 
-    Error output:
+Error output:
 
-    ```
-    The PGDGroup "region-a" is invalid: spec.backup.cron.schedule: Invalid value: "": Empty spec string
-    ``` 
+```
+The PGDGroup "region-a" is invalid: spec.backup.cron.schedule: Invalid value: "": Empty spec string
+``` 
 
-    To work around this issue, add a `spec.backup.cron.schedule` section with a schedule that meets your requirements. 
+To work around this issue, add a `spec.backup.cron.schedule` section with a schedule that meets your requirements.