Update playbooks_delegation.rst (#46254)

Fix example variable lookup.

+label: docsite_pr

docs/docsite/rst/user_guide/playbooks_delegation.rst

@@ -195,7 +195,7 @@ The directive `delegate_facts` may be set to `True` to assign the task's gathere
           loop: "{{groups['dbservers']}}"
 
 The above will gather facts for the machines in the dbservers group and assign the facts to those machines and not to app_servers.
-This way you can lookup `hostvars['dbhost1']['default_ipv4']['address']` even though dbservers were not part of the play, or left out by using `--limit`.
+This way you can lookup `hostvars['dbhost1']['ansible_default_ipv4']['address']` even though dbservers were not part of the play, or left out by using `--limit`.
 
 
 .. _run_once: