docs: Update Dropdown basic demo icon

components/dropdown/__tests__/__snapshots__/demo-extend.test.ts.snap

@@ -2663,13 +2663,13 @@ Array [
           role="menuitem"
         >
           <span
-            aria-label="down"
-            class="anticon anticon-down ant-dropdown-menu-item-icon"
+            aria-label="smile"
+            class="anticon anticon-smile ant-dropdown-menu-item-icon"
             role="img"
           >
             <svg
               aria-hidden="true"
-              data-icon="down"
+              data-icon="smile"
               fill="currentColor"
               focusable="false"
               height="1em"
@@ -2677,7 +2677,7 @@ Array [
               width="1em"
             >
               <path
-                d="M884 256h-75c-5.1 0-9.9 2.5-12.9 6.6L512 654.2 227.9 262.6c-3-4.1-7.8-6.6-12.9-6.6h-75c-6.5 0-10.3 7.4-6.5 12.7l352.6 486.1c12.8 17.6 39 17.6 51.7 0l352.6-486.1c3.9-5.3.1-12.7-6.4-12.7z"
+                d="M288 421a48 48 0 1096 0 48 48 0 10-96 0zm352 0a48 48 0 1096 0 48 48 0 10-96 0zM512 64C264.6 64 64 264.6 64 512s200.6 448 448 448 448-200.6 448-448S759.4 64 512 64zm263 711c-34.2 34.2-74 61-118.3 79.8C611 874.2 562.3 884 512 884c-50.3 0-99-9.8-144.8-29.2A370.4 370.4 0 01248.9 775c-34.2-34.2-61-74-79.8-118.3C149.8 611 140 562.3 140 512s9.8-99 29.2-144.8A370.4 370.4 0 01249 248.9c34.2-34.2 74-61 118.3-79.8C413 149.8 461.7 140 512 140c50.3 0 99 9.8 144.8 29.2A370.4 370.4 0 01775.1 249c34.2 34.2 61 74 79.8 118.3C874.2 413 884 461.7 884 512s-9.8 99-29.2 144.8A368.89 368.89 0 01775 775zM664 533h-48.1c-4.2 0-7.8 3.2-8.1 7.4C604 589.9 562.5 629 512 629s-92.1-39.1-95.8-88.6c-.3-4.2-3.9-7.4-8.1-7.4H360a8 8 0 00-8 8.4c4.4 84.3 74.5 151.6 160 151.6s155.6-67.3 160-151.6a8 8 0 00-8-8.4z"
               />
             </svg>
           </span>

components/dropdown/demo/basic.md

@@ -15,7 +15,7 @@ The most basic dropdown menu.
 
 ```jsx
 import { Menu, Dropdown } from 'antd';
-import { DownOutlined } from '@ant-design/icons';
+import { DownOutlined, SmileOutlined } from '@ant-design/icons';
 
 const menu = (
   <Menu
@@ -33,7 +33,7 @@ const menu = (
             2nd menu item (disabled)
           </a>
         ),
-        icon: <DownOutlined />,
+        icon: <SmileOutlined />,
         disabled: true,
       },
       {