Mention the Literal Style

docs/contributing/Regular-Expression-Regex.html

@@ -274,6 +274,7 @@ Example 1234.esp
   <li>The period <code>.</code> has been escaped through writing a backslash <code>\</code> in front of it.</li>
   <li>The expression <code>\d{3,}</code> finds plugins that contain three or more digits.</li>
   <li>In addition to the regex this example also showcases a method to display blocks of code within a message for plugins.</li>
+  <li>This is achieved through using the <i>Literal Style</i>, which is denoted by the <code>|</code> indicator. See <a href="https://yaml.org/spec/1.2.2/#23-scalars">yaml.org</a> for more information.</li>
   <li>The mentioned <code>Skyrim.ini</code> can be found in <code>C:\Users\USER\Documents\My Games\Skyrim</code></li>
 </ul>