Add a missing :: in an .rst file

Other changes are just eating trailing whitespace.

docsite/rst/playbooks2.rst

@@ -994,7 +994,7 @@ to externalize data from the playbook rules itself, this is possible by combinin
 This is not something everyone may need to do at first, but it's a clever trick and deserves explanation.
 Here is a top level example playbook that loads variables from an external file and also tasks from an
 external file.  You will note that we use a list (using with_items) as a parameter on the include
-statement.
+statement::
 
     ----
     # file: playbook-demo.yml