There are problems with documentation page: https://wiki.servoy.com/display/DOCS/Business+logic
Error: You are trying to view a page which does not yet have a published version available and you do not have permission to view draft versions.
I could open that page without problems.
There are just two links on that page, maybe those work for you:
https://wiki.servoy.com/display/public/DOCS/JavaScript+Basics
https://wiki.servoy.com/display/public/DOCS/JSDoc+Annotations