Meta: bump ecmarkup to v20.0.0 (tc39#3476)

package.json

@@ -24,7 +24,7 @@
   "license": "SEE LICENSE IN https://tc39.es/ecma262/#sec-copyright-and-software-license",
   "homepage": "https://tc39.es/ecma262/",
   "devDependencies": {
-    "ecmarkup": "^19.1.0",
+    "ecmarkup": "^20.0.0",
     "glob": "^7.1.6",
     "jsdom": "^15.0.0",
     "pagedjs": "^0.4.3",

spec.html

@@ -934,6 +934,8 @@ <h1>
         <dl class="header">
           <dt>description</dt>
           <dd>It is used to emphasize that a Completion Record is being returned.</dd>
+          <dt>skip return checks</dt>
+          <dd>true</dd>
         </dl>
         <emu-alg>
           1. Assert: _completionRecord_ is a Completion Record.
@@ -4182,6 +4184,8 @@ <h1>
           ): a normal completion
         </h1>
         <dl class="header">
+          <dt>skip return checks</dt>
+          <dd>true</dd>
         </dl>
         <emu-alg>
           1. Return Completion Record { [[Type]]: ~normal~, [[Value]]: _value_, [[Target]]: ~empty~ }.
@@ -48850,6 +48854,8 @@ <h1>
           ): either a normal completion containing an ECMAScript language value or an abrupt completion
         </h1>
         <dl class="header">
+          <dt>skip return checks</dt>
+          <dd>true</dd>
         </dl>
         <emu-alg>
           1. Let _genContext_ be the running execution context.