Status for Explainer & Modules 1,2,3 refer to ARIA not APA

[clapierre]

All 3 modules and the Explainer have in the Status of the document section references to AIRA instead of APA.

IE:
Status of This Document

This document was published by the Accessible Rich Internet Applications Working Group as an Editor's Draft.

[ruoxiran]

All the status have been changed to APA.