Add more comment for TODO.

Author: sainthkh

packages/runner-shared/src/header/index.tsx

@@ -262,6 +262,8 @@ export class Header extends Component<HeaderProps> {
 
     if (!this._studioNeedsUrl) return
 
+    // Note: changes in TypeScript 4.4.4 made the code below fail the type check.
+    // @see https://github.com/cypress-io/cypress/pull/18930
     // TODO: studio/studio-recorder.js should be converted to ts. And add proper type.
     // @ts-ignore
     studioRecorder.visitUrl(this.urlInput)