Add example of multi-version JSON file (#253)
Add example of multi-version JSON file (#253)

* Corrected "version" to "vers" in the field description.
  Added example of multi-version JSON file
* corrected plugin to plug-in

Signed-off-by: Eliot Kimber <213182e444b149646964c5dd11fcba7e150ed43f@contrext.com>

infotexture/docs,infotexture/docs,dita-ot/docs