Update docs/self-hosted/kubernetes-maintenance.md

Co-authored-by: Stephan <[email protected]>

Author: IgorBenko

docs/self-hosted/kubernetes-maintenance.md

@@ -31,7 +31,7 @@ kubectl kots admin-console upgrade -n NAMESPACE
 
 Replace `NAMESPACE` with the namespace in your cluster where KOTS is installed.
 
-### Updating or Replacing the SSL Certificate
+### Update or replace the SSL certificate
 
 The following applies only to kURL installations. To update or replace the certificate, you must first restore the ability 
 to upload new TLS certificates and then reupload the certificate through the user interface. Please refer to