Remove WebIDL from explainer.md since they are now in the spec (#93)

SHA: 1922fed
Reason: push, by @youennf

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: youennf

index.html

@@ -7,7 +7,7 @@
   <link href="https://www.w3.org/StyleSheets/TR/2016/W3C-ED" rel="stylesheet" type="text/css">
   <meta content="Bikeshed version c5fd42b86, updated Mon Apr 5 16:27:33 2021 -0700" name="generator">
   <link href="https://w3c.github.io/webrtc-encoded-transform/" rel="canonical">
-  <meta content="1bc19467da0cc2025f712bfb4982abc832b0c002" name="document-revision">
+  <meta content="1922fede2575b25cf978f0bd7057b2abe9ddec0b" name="document-revision">
 <style>/* style-autolinks */
 
 .css.css, .property.property, .descriptor.descriptor {
@@ -568,7 +568,7 @@
   <div class="head">
    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2016/logos/W3C" width="72"> </a> </p>
    <h1 class="p-name no-ref" id="title">WebRTC Encoded Transform</h1>
-   <h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="content">Editor’s Draft, <time class="dt-updated" datetime="2021-04-12">12 April 2021</time></span></h2>
+   <h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="content">Editor’s Draft, <time class="dt-updated" datetime="2021-04-15">15 April 2021</time></span></h2>
    <div data-fill-with="spec-metadata">
     <dl>
      <dt>This version: