Update content of files

data/core.telegram.org/stickers.html

@@ -84,7 +84,7 @@
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 <h4><a class="anchor" name="creating-video-stickers" href="#creating-video-stickers"><i class="anchor-icon"></i></a>Creating Video Stickers</h4>
-<p>To create Video Stickers, you only need <a href="https://core.telegram.org/stickers/webm-vp9-encoding">editing software</a> that lets you export your project as a <strong>.WEBM video file</strong> (alpha channel no longer required).</p>
+<p>To create Video Stickers, you only need <a href="https://core.telegram.org/stickers/webm-vp9-encoding">editing software</a> that lets you export your project as a <strong>.WEBM video file</strong> (alpha channel <strong>no longer required</strong>).</p>
 <h4><a class="anchor" name="video-sticker-requirements" href="#video-sticker-requirements"><i class="anchor-icon"></i></a>Video Sticker Requirements</h4>
 <blockquote>
 <p>See this <a href="https://core.telegram.org/stickers/webm-vp9-encoding">Encoding .WEBM with VP9 Guide</a> for details </p>

data/core.telegram.org/stickers/webm-vp9-encoding.html

@@ -47,7 +47,7 @@
 <li>Video must have <strong>no audio stream</strong>.</li>
 <li>One side must be <strong>512 pixels</strong> in size – the other side can be 512 pixels <strong>or less</strong>.</li>
 <li>Duration must not exceed <strong>3 seconds</strong>.</li>
-<li>Video must have a <strong>transparent layer</strong> (this is a temporary requirement).</li>
+<li><del>Video must have a transparent layer</del> (this is no longer required).</li>
 <li>Video should be looped for optimal user experience.</li>
 <li>Video size should not exceed <strong>256 KB</strong> after encoding. </li>
 </ul>