Updated the default namespace for operator (#6215)

Co-authored-by: Vincent Hou <shou73@bloomberg.net>

Author: knative-prow-robot

docs/install/operator/knative-with-operators.md

@@ -33,10 +33,10 @@ You can find information about the released versions of the Knative Operator on
 
 ### Verify your Knative Operator installation
 
-1. Because the Operator is installed to the `default` namespace, ensure you set the current namespace to `default` by running the command:
+1. Because the Operator is installed to the `knative-operator` namespace, ensure you set the current namespace to `default` by running the command:
 
     ```bash
-    kubectl config set-context --current --namespace=default
+    kubectl config set-context --current --namespace=knative-operator
     ```
 
 1. Check the Operator deployment status by running the command: