* Update the label names to make it clear that these descriptions are not for the term name or slug itself, but for the Name, Slug, Parent, and Description fields:
* `name_field_description`
* `slug_field_description`
* `parent_field_description`
* `desc_field_description`
* Update the array structure to make it clear that the default values for these labels are the same for both hierarchical and non-hierarchical taxonomies, with the exception of `parent_field_description`.
* Add documentation and a `@since` note for the new labels.
Follow-up to [52094].
Fixes#43060.
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