docs: update example on read workspace in devkit core page

Author: Free Editable Mind Maps

packages/angular_devkit/core/README.md

@@ -144,7 +144,7 @@ import { workspaces } from '@angular-devkit/core';
 
 async function demonstrate() {
  const host = workspaces.createWorkspaceHost(new NodeJsSyncHost());
- const workspace = await workspaces.readWorkspace('path/to/workspace/directory/', host);
+ const { workspace } = await workspaces.readWorkspace('path/to/workspace/directory/', host);
 
  const project = workspace.projects.get('my-app');
  if (!project) {