Merge pull request #2926 from stoned/doc-fix

Fix registered variable usage example

docsite/latest/rst/playbooks2.rst

@@ -728,7 +728,7 @@ The 'register' keyword decides what variable to save a result in.  The resulting
             register: motd_contents
 
           - action: shell echo "motd contains the word hi"
-            when: motd_contents.find('hi') != -1
+            when: motd_contents.stdout.find('hi') != -1
 
 
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