feat(docs): extend avt2 testing documentation (#1483)
feat(docs): extend avt2 testing documentation (#1483)

* feat(docs): add av2guidance file

* feat(docs): add initial avt2 guidance documentation

* feat(docs): add how do we test section

* feat(docs): add avt2 documentation

* fix(docs): spellcheck and padd out how to test section

* fix(docs): change interactible to interactable

carbon-design-system/carbon-components,carbon-design-system/carbon-components,carbon-design-system/carbon-components