Remove duplicated content. (#11447)

In distribute-credentials-secure.md,
It seems it has duplicated content with line from #82 to #85.

content/en/docs/tasks/inject-data-application/distribute-credentials-secure.md

@@ -43,13 +43,6 @@ username and password:
     kubectl create -f https://k8s.io/docs/tasks/inject-data-application/secret.yaml
     ```
 
-    {{< note >}}
- If you want to skip the Base64 encoding step, you can create a Secret by using the `kubectl create secret` command:
- ```shell
- kubectl create secret generic test-secret --from-literal=username='my-app' --from-literal=password='39528$vdg7Jb'
- ```
-    {{< /note >}}
-
 1. View information about the Secret:
 
        kubectl get secret test-secret