fix a shell command in examples

Author: able8

content/en/docs/concepts/workloads/pods/init-containers.md

@@ -83,7 +83,7 @@ Here are some ideas for how to use init containers:
 * Wait for a {{< glossary_tooltip text="Service" term_id="service">}} to
   be created, using a shell one-line command like:
   ```shell
-  for i in {1..100}; do sleep 1; if dig myservice; then exit 0; fi; done; exit 1
+  for i in {1..100}; do sleep 1; if nslookup myservice; then exit 0; fi; done; exit 1
   ```
 
 * Register this Pod with a remote server from the downward API with a command like: