Update guideline.mdx

Author: ItsLemmy

src/content/docs/development/guideline.mdx

@@ -18,7 +18,7 @@ Noctalia/
 ├── shell.qml                   # Main shell entry point
 ├── Modules/                    # UI components and panels
 │   ├── Bar/                    # Status bar and widgets
-│   ├── Desktop Widgets/        # Desktop widgets panel
+│   ├── DesktopWidgets/         # Desktop widgets panel
 │   ├── Dock/                   # Application dock
 │   ├── Launcher/               # Application launcher
 │   ├── Settings/               # Settings panel