spec: add commit hash for 402 spec

Author: ryzokuken

spec/intl.html

@@ -9,6 +9,9 @@ <h1>Amendments to the ECMAScript® 2021 Internationalization API Specification</
       This section lists amendments which must be made to <a href="https://tc39.es/ecma402/">ECMA-402, the ECMAScript® 2021 Internationalization API Specification</a>.
       Text to be added is marked <ins>like this</ins>, and text to be deleted is marked <del>like this</del>.
     </p>
+    <p>
+      This text is based on top of the ECMA-402 spec text from commit <a href="https://github.com/tc39/ecma402/commit/b5edf2cdcca8d69590796cd41abf8399d249b8a1">b5edf2cdcca8d69590796cd41abf8399d249b8a1</a>.
+    </p>
   </emu-note>
 
   <emu-clause id="sup-time-zone-names">