Simplify and clarify explanation of how field_display_hints is applied to paged content

[mjordan]

https://mjordan.github.io/islandora_workbench_docs/paged_and_compound/#using-subdirectories contains the following gobbledygook:

You should also include a field_display_hints column in your CSV. This value is applied to the parent nodes and also the page nodes, unless the paged_content_page_display_hints setting is present in you configuration file. However, if you normally don't set the "Display hints" field in your objects but use a Context to determine how objects display, you should not include a field_display_hints column in your CSV file.

This has to be made clearer.