doc: Remove deprecation warning for the opensearch-operator

Author: siegfriedweber

docs/modules/opensearch/examples/getting_started/opensearch.yaml

@@ -10,7 +10,7 @@ spec:
     security:
       settings:
         config:
-          managedBy: operator
+          managedBy: API
           content:
             value:
               _meta:

docs/modules/opensearch/pages/index.adoc

@@ -13,11 +13,6 @@
 * {feature-tracker}[Feature Tracker{external-link-icon}^]
 * {crd}[CRD documentation{external-link-icon}^]
 
-[WARNING]
-====
-This operator is experimental, and subject to change.
-====
-
 The Stackable operator for {opensearch}[OpenSearch{external-link-icon}^] deploys and manages OpenSearch clusters on Kubernetes.
 OpenSearch is a powerful search and analytics engine built on Apache Lucene.
 This operator helps you manage your OpenSearch instances on Kubernetes efficiently.