doc: Note that Stage 3 is conditional on editor review

Author: js-choi

README.md

@@ -1,5 +1,5 @@
 # Array.fromAsync for JavaScript
-ECMAScript Stage-3 Proposal. J. S. Choi, 2021.
+ECMAScript Stage-3 (conditional on editor review) Proposal. J. S. Choi, 2021.
 
 * **[Specification][]** available
 * **Experimental polyfills** (do **not** use in production code yet):

spec.html

@@ -1,7 +1,7 @@
 <pre class=metadata>
 title: ES Array.fromAsync (2022)
 status: proposal
-stage: 3
+stage: 2
 location: https://github.com/js-choi/proposal-array-async-from
 copyright: false
 contributors: J. S. Choi