changed optional parameter to be used for wrap attributes (if installed)

The former optional parameter was used for the 'cite' attribute. This was
changed for the following reasons:
* The 'cite' attribute is still not supported by any browser yet.
* Due to the bad example on the plugin's page, it is only used in a way which produces invalid HTML. (I.e. it should be a URL and not a name.)
* The same effect can be achieved by using the `<cite>` element.
* Hardly anyone uses it.