Fix validation errors

Author: dschuff

document/js-api/index.bs

@@ -1331,12 +1331,12 @@ The following sections provide an overview of what has changed.</p>
 
 <h3 id="release-20">Release 2.0</h3>
 
-<h4 class="no-toc heading settled">Multiple Values</h4>
+<h4 id="changes-multivalue" class="no-toc heading settled">Multiple Values</h4>
 Multiple values can be returned from WebAssembly functions into JavaScript as an [=Array=] object.
 
-<h4 class="no-toc heading settled">BigInt Integration</h4>
+<h4 id="changes-bigint" class="no-toc heading settled">BigInt Integration</h4>
 WebAssembly [=i64=] values can be passed to and from JavaScript (via imported or exported globals, table get or set operations, function return values or arguments) as [=BigInt=] objects.
 
-<h4 class="no-toc heading settled">Reference types</h4>
+<h4 id="changes-reftypes" class="no-toc heading settled">Reference types</h4>
 JavaScript values can be passed to and from WebAssembly (via imported or exported globals, table set or get operations, and function arguments or return values) as [=externref=] values.
 Multiple tables can be exported and imported to and from JavaScript.

document/web-api/index.bs

@@ -313,5 +313,5 @@ application/wasm
 The following sections provide an overview of what has changed.</p>
 
 <h3 id="release-20">Release 2.0</h3>
-<h4 class="no-toc heading settled">Media-type Registraton Completed</h4>
+<h4 id="changes-registration" class="no-toc heading settled">Media-type Registraton Completed</h4>
 The registration for the `application/wasm` media type has been successfully completed.