It is suggested that we should allow the user to specify more info in the {@systemProperty} tag.

This info might include:

* a short description to include in the search index and property summary page
* the "scope" of the name (Java SE, JDK, etc)
* whether the name is deprecated or not

There are no proposals for syntax at this stage. [See proposed syntax in comments]

Each change to the tag implies corresponding changes to elsewhere in the doclet, to utilize that information. For example, scope and/or description would be reflected on the property summary page; deprecation info would appear on the deprecation page.