Update nclu.py (#40369) (#43364)

* Update nclu.py
Added NCLU BGP Unnumbered Example
+label: ansible/ansible#40323
* Adding AS number example
(cherry picked from commit a9dc79e07b)

lib/ansible/modules/network/cumulus/nclu.py

@@ -79,6 +79,15 @@ EXAMPLES = '''
         - add int swp1
     atomic: true
     description: "Ansible - add swp1"
+
+- name: Configure BGP AS and add 2 EBGP neighbors using BGP Unnumbered
+  nclu:
+    commands:
+        - add bgp autonomous-system 65000
+        - add bgp neighbor swp51 interface remote-as external
+        - add bgp neighbor swp52 interface remote-as external
+    commit: true
+
 '''
 
 RETURN = '''