Fixed a logical error in the documentation.

The documentation states that if a key is present and it
has a value of false or an empty list, then the content
between the pound sign and slash will not be shown.

The documentation had the key "person" with a true value,
which means that what {{#person}} {{/person}} was wrapping
would infact be shown.  The output however did not include
the contents of what {{#person}} {{/person}} wrapped.

If person is true, then the content should be shown, if
false, then not.
Changed the template example for false/empty lists

Changed the template to check if 'person' is empty rather
than 'nothin' which was never defined. This shows a more
accurate and clear example of how a false or empty value
will result in the section not being shown.