Update docs/modules/opensearch/pages/usage-guide/security.adoc

Co-authored-by: Malte Sander <malte.sander.it@gmail.com>

Author: siegfriedweber

docs/modules/opensearch/pages/usage-guide/security.adoc

@@ -182,7 +182,7 @@ Only a lifetime up to the `maxCertificateLifetime` setting in the SecretClass is
 
 [IMPORTANT]
 ====
-The operator sets the configuration `plugins.security.nodes_dn` to `["CN=generated certificate for pod"]` which provides weak authentication between nodes.
+The operator sets the configuration `plugins.security.nodes_dn` to `["CN=generated certificate for pod"]`, which provides weak authentication between nodes.
 For enhanced security, use certificates that uniquely identify the OpenSearch nodes.
 In this case, you must also adapt the `plugins.security.nodes_dn` setting via configOverrides.
 ====