made condition not simplifiable to 'in'

docsite/rst/playbooks_conditionals.rst

@@ -31,10 +31,10 @@ It's actually pretty simple::
 You can also use parentheses to group conditions::
 
     tasks:
-      - name: "shutdown CentOS 6 and 7 systems"
+      - name: "shutdown CentOS 6 and Debian 7 systems"
         command: /sbin/shutdown -t now
-        when: ansible_distribution == "CentOS" and
-              (ansible_distribution_major_version == "6" or ansible_distribution_major_version == "7")
+        when: (ansible_distribution == "CentOS" and ansible_distribution_major_version == "6") or
+              (ansible_distribution == "Debian" and ansible_distribution_major_version == "7")
 
 A number of Jinja2 "filters" can also be used in when statements, some of which are unique
 and provided by Ansible.  Suppose we want to ignore the error of one statement and then