Add identifies, defines, and indicates to the terms list, and link every use in the attrs list.

These terms are used as the first word of each ARIA attribute definition.

For example:

1. When you discover aria-checked is required on checkbox, the checked state "indicates" a value, so check the attr description.
2. When you discover aria-owns may be useful, it "identifies" an element, so you'd use an IDREF.

Section 6.6. All aria-* attrs
https://www.w3.org/TR/wai-aria-1.1/#state_prop_def