Editorial: change x-frame-options obsoletes wording

index.bs

@@ -3677,7 +3677,7 @@ Content-Type: application/reports+json
   header's \``DENY`\`, and `'self'` to that header's \``SAMEORIGIN`\`. [[!HTML]]
 
   In order to allow backwards-compatible deployment, the
-  <a>`frame-ancestors`</a> directive <em>obsoletes</em> the
+  <a>`frame-ancestors`</a> directive <em>overrides</em> the
   \`<code>[:X-Frame-Options:]</code>\` header. If a resource is delivered with
   a <a for="/">policy</a> that includes a <a>directive</a> named
   <a>`frame-ancestors`</a> and whose <a for="policy">disposition</a> is