ip_netns: fix module name in example (#207)

* ip_netns: fix module name in example

Was referenced as 'namespace' while it should have been 'ip_netns'.

Closes: #203
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>

* Update plugins/modules/net_tools/ip_netns.py

* Update plugins/modules/net_tools/ip_netns.py

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

plugins/modules/net_tools/ip_netns.py

@@ -44,13 +44,13 @@ options:
 '''
 
 EXAMPLES = '''
-# Create a namespace named mario
 - name: Create a namespace named mario
-  namespace:
+  ip_netns:
     name: mario
     state: present
+
 - name: Delete a namespace named luigi
-  namespace:
+  ip_netns:
     name: luigi
     state: absent
 '''