[#188]: Remove pseudo YAML tag syntax in C.4.1 heading

Author: anatoly-scherbakov

index.html

@@ -2744,7 +2744,7 @@ <h2>Convert Extended YAML-LD to Basic YAML-LD and back</h2>
         </table>
 
         <section id="tags-to-types">
-          <h2>YAML <code>!tags</code> → <code>@type</code> declarations</h2>
+          <h2>YAML tag shorthands → <code>@type</code> declarations</h2>
 
           <div style="display: flex">
               <div>