fix headings

Author: micheleRP

modules/manage/pages/disaster-recovery/shadowing/setup.adoc

@@ -504,7 +504,7 @@ client_options:
   fetch_partition_max_bytes: 1048576  # Default 1MB, maximum bytes to fetch per partition
 ----
 
-=== Create a shadow link
+== Create a shadow link
 
 ifdef::env-cloud[]
 You can establish a shadow link using either `rpk`, the Data Plane API, or the Redpanda Cloud UI. For example, to create a shadow link with the source cluster, run the following `rpk` command from the shadow cluster:
@@ -521,7 +521,7 @@ rpk shadow create --config-file shadow-config.yaml
 
 For detailed command options, see xref:reference:rpk/rpk-shadow/rpk-shadow-create.adoc[`rpk shadow create`].
 
-=== Update an existing shadow link
+== Update an existing shadow link
 
 If you need to modify a shadow link configuration after creation, use the update command: