Found undocumented prefilter functionality

[andre-badenhorst-crust-tech]

The following link and description of the prefilter and module relationships would benefit the docs.
This is undocumented and will provide a clearer sense and example of the implementation.

https://forum.cortezaproject.org/t/get-records-that-depend-on-other-records/631

The next link makes a suggestion that this be added to the page suggestions in the code as well

https://forum.cortezaproject.org/t/add-record-context-availbility-in-prefilter-to-docs/1276