docs: import from module instead of root to decrease bundle size

Signed-off-by: Akshat Patel <38994122+Akshat55@users.noreply.github.com>

Author: Akshat55

integration/ng16/src/app/app.component.ts

@@ -1,7 +1,8 @@
 import { Component } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { RouterOutlet } from '@angular/router';
-import { DropdownModule, ButtonModule, ListItem } from 'carbon-components-angular';
+import { DropdownModule, ListItem } from 'carbon-components-angular/DropdownModule';
+import { ButtonModule } from 'carbon-components-angular/ButtonModule';
 
 @Component({
   selector: 'app-root',