outputRefs value is missing in Forwarding logs over HTTP documentation

- `outputRefs` value is missing in Forwarding logs over HTTP documentation.
- Here is the documentation link: https://docs.openshift.com/container-platform/4.16/observability/logging/log_collection_forwarding/configuring-log-forwarding.html#logging-http-forward_configuring-log-forwarding
- This `outputRefs` value should be the same as the output name.
- It is missing here.
- Here is the current configuration:
~~~
apiVersion: logging.openshift.io/v1
kind: ClusterLogForwarder
metadata:
  name: <log_forwarder_name> 
  namespace: <log_forwarder_namespace> 
spec:
  serviceAccountName: <service_account_name> 
  outputs:
    - name: httpout-app
      type: http
      url: 
      http:
        headers: 
          h1: v1
          h2: v2
        method: POST
      secret:
        name: 
      tls:
        insecureSkipVerify: 
  pipelines:
    - name:
      inputRefs:
        - application
      outputRefs:
        - 
~~~
- Hence we need to add the `outputRefs` value here.
- Here is the correct configuration:
~~~

~~~

Author: prithvipatil97

modules/logging-http-forward.adoc

@@ -40,7 +40,7 @@ spec:
       inputRefs:
         - application
       outputRefs:
-        - <8>
+        - httpout-app <8>
 ----
 <1> In legacy implementations, the CR name must be `instance`. In multi log forwarder implementations, you can use any name.
 <2> In legacy implementations, the CR namespace must be `openshift-logging`. In multi log forwarder implementations, you can use any namespace.