Update panos_op.py (ansible#39013)

<!--- Your description here -->
The examples were apparently pasted from panos_object and the module name wasn't updated.
+label: docsite_pr

lib/ansible/modules/network/panos/panos_op.py

@@ -61,14 +61,14 @@
 
 EXAMPLES = '''
 - name: show list of all interfaces
-  panos_object:
+  panos_op:
     ip_address: '{{ ip_address }}'
     username: '{{ username }}'
     password: '{{ password }}'
     cmd: 'show interfaces all'
 
 - name: show system info
-  panos_object:
+  panos_op:
     ip_address: '{{ ip_address }}'
     username: '{{ username }}'
     password: '{{ password }}'