refactor(platform-server): add link that explains nonce application/json (angular#55505)

Add a link to the specs explaining why nonce is not needed for `application/json`. PR Close angular#55505

Author: alan-agius4

packages/platform-server/src/transfer_state.ts

@@ -50,7 +50,11 @@ function serializeTransferStateFactory(doc: Document, appId: string, transferSto
  const script = createScript(
  doc,
  content,
- null /** nonce is not required for 'application/json' */,
+ /**
+ * `nonce` is not required for 'application/json'
+ * See: https://html.spec.whatwg.org/multipage/scripting.html#attr-script-type
+ */
+ null,
  );
  script.id = appId + '-state';
  script.setAttribute('type', 'application/json');