Change docs to reflect correct when syntax for matching variable strings as per MD's forum post as this fails with unhelpful error otherwise.

https://groups.google.com/forum/#!topic/ansible-project/D2hQzZ_jNuM

lib/ansible/modules/network/basics/uri.py

@@ -155,7 +155,7 @@ EXAMPLES = '''
   register: webpage
 
 - action: fail
-  when: 'AWESOME' not in "{{ webpage.content }}"
+  when: "'illustrative' not in webpage.content"
 
 
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