Appears unused since 585b7aca.

This is consistent with ability to reference other descriptors
on the model class (5ef0c03a).

Thanks Simon Charette for the DeprecationInstanceCheck class.

Thanks Anjul Tyagi for some of the draft text.

This avoids creating an empty list which is invalid HTML 4.

Thanks Stavros Korokithakis for the report and Tim Graham for the
review.

Thanks Tim Graham for the patch series review.

Left over Oracle mostly as-is since it's more complicated.

Thanks aklim007 for the suggestion.

Obsolete since 4a66a692.