Fix all ACI examples to use delegate_to (#43439)

This is to avoid users connecting to the APIC using SSH, which is likely
to fail. In the ACI documentation (linked from every module) we go into
more details on how people are supposed to work with the modules..

lib/ansible/modules/network/aci/aci_fabric_node.py

@@ -68,6 +68,7 @@ EXAMPLES = r'''
     node_id: 1011
     switch: fab4-sw1011
     state: present
+  delegate_to: localhost
 
 - name: Remove fabric node
   aci_fabric_node:
@@ -77,6 +78,7 @@ EXAMPLES = r'''
     serial: FDO2031124L
     node_id: 1011
     state: absent
+  delegate_to: localhost
 
 - name: Query fabric nodes
   aci_fabric_node:
@@ -84,6 +86,8 @@ EXAMPLES = r'''
     username: admin
     password: SomeSecretPassword
     state: query
+  delegate_to: localhost
+  register: query_result
 '''
 
 RETURN = r'''