Fix module not found error by removing explicit Callout import

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

content/docs/plugins/plugin-calendar-view.mdx

@@ -2,8 +2,6 @@
 title: "Plugin Calendar View"
 ---
 
-import { Callout } from 'fumadocs-ui/components/callout';
-
 <Callout type="info" title="Merged into Plugin Calendar">
   The `@object-ui/plugin-calendar-view` package has been merged into `@object-ui/plugin-calendar`.