Editorial: Sign introduction (#3032)

Author: bakkot

spec.html

@@ -122,6 +122,18 @@ <h1>Introduction</h1>
     Jordan Harband<br>
     ECMA-262, Project Editor, 10<sup>th</sup> through 12<sup>th</sup> Editions
   </p>
+  <p>
+    Shu-yu Guo<br>
+    ECMA-262, Project Editor, 12<sup>th</sup> through 14<sup>th</sup> Editions
+  </p>
+  <p>
+    Michael Ficarra<br>
+    ECMA-262, Project Editor, 12<sup>th</sup> through 14<sup>th</sup> Editions
+  </p>
+  <p>
+    Kevin Gibbons<br>
+    ECMA-262, Project Editor, 12<sup>th</sup> through 14<sup>th</sup> Editions
+  </p>
 </emu-intro>
 
 <emu-clause id="sec-scope">