remove outdated comment

packages/remark-drawio/src/utils/embed.ts

@@ -73,7 +73,6 @@ export const generateMxgraphData = (code: string): string => {
     </mxfile>
   `;
 
-  // see options: https://drawio.freshdesk.com/support/solutions/articles/16000042542-embed-html
   const mxGraphData = {
     editable: false,
     highlight: '#0000ff',