Fix lineinfile example

The examples comment said 'Add a line to a file if it does not exist, without passing regexp' which suggests, that the file is being created. But the default for 'create' is false. Thus the example lacked this option.

lib/ansible/modules/files/lineinfile.py

@@ -154,6 +154,7 @@ EXAMPLES = r"""
 - lineinfile:
     path: /tmp/testfile
     line: '192.168.1.99 foo.lab.net foo'
+    create: true
 
 # Fully quoted because of the ': ' on the line. See the Gotchas in the YAML docs.
 - lineinfile: