Update imperative-command.md

- Original example (with <myservicename> replaced with my-svc) will result in the following error:
error: at least one tcp port specifier must be provided

- Use the same example in this section seems ideal

docs/concepts/overview/object-management-kubectl/imperative-command.md

@@ -127,7 +127,7 @@ creation. This is done by piping the output of the `create` command to the
 `set` command, and then back to the `create` command. Here's an example:
 
 ```sh
-kubectl create service clusterip <myservicename> -o yaml --dry-run | kubectl set selector --local -f - 'environment=qa' -o yaml | kubectl create -f -
+kubectl create service clusterip my-svc --clusterip="None" -o yaml --dry-run | kubectl set selector --local -f - 'environment=qa' -o yaml | kubectl create -f -
 ```
 
 1. The `kubectl create service -o yaml --dry-run` command creates the configuration for the Service, but prints it to stdout as YAML instead of sending it to the Kubernetes API server.