docs: update alert & drawer doc in closeIcon default value (#5838)

Author: peritot

components/alert/index.en-US.md

@@ -19,7 +19,7 @@ Alert component for feedback.
 | afterClose | Called when close animation is finished | () => void | - |  |
 | banner | Whether to show as banner | boolean | false |  |
 | closable | Whether Alert can be closed | boolean |  |  |
-| closeIcon | Custom close icon | slot | <CloseOutlined /> | 3.0 |
+| closeIcon | Custom close icon | slot | `<CloseOutlined />` | 3.0 |
 | closeText | Close text to show | string\|slot | - |  |
 | description | Additional content of Alert | string\|slot | - |  |
 | icon | Custom icon, effective when `showIcon` is `true` | vnode \| slot | - |  |

components/alert/index.zh-CN.md

@@ -20,7 +20,7 @@ cover: https://gw.alipayobjects.com/zos/alicdn/8emPa3fjl/Alert.svg
 | afterClose | 关闭动画结束后触发的回调函数 | () => void | - |  |
 | banner | 是否用作顶部公告 | boolean | false |  |
 | closable | 默认不显示关闭按钮 | boolean | 无 |  |
-| closeIcon | 自定义关闭 Icon | slot | <CloseOutlined /> | 3.0 |
+| closeIcon | 自定义关闭 Icon | slot | `<CloseOutlined />` | 3.0 |
 | closeText | 自定义关闭按钮 | string\|slot | 无 |  |
 | description | 警告提示的辅助性文字介绍 | string\|slot | 无 |  |
 | icon | 自定义图标，`showIcon` 为 `true` 时有效 | vnode\|slot | - |  |

components/drawer/index.en-US.md

@@ -23,7 +23,7 @@ A Drawer is a panel that is typically overlaid on top of a page and slides in fr
 | bodyStyle | Style of the drawer content part | CSSProperties | - |  |
 | class | The class name of the container of the Drawer dialog | string | - |  |
 | closable | Whether a close (x) button is visible on top left of the Drawer dialog or not | boolean | true |  |
-| closeIcon | Custom close icon | VNode \| slot | <CloseOutlined /> | 3.0.0 |
+| closeIcon | Custom close icon | VNode \| slot | `<CloseOutlined />` | 3.0.0 |
 | contentWrapperStyle | Style of the drawer wrapper of content part | CSSProperties | - | 3.0.0 |
 | destroyOnClose | Whether to unmount child components on closing drawer or not | boolean | false |  |
 | drawerStyle | Style of the popup layer element | object | - |  |

components/drawer/index.zh-CN.md

@@ -23,7 +23,7 @@ cover: https://gw.alipayobjects.com/zos/alicdn/7z8NJQhFb/Drawer.svg
 | bodyStyle | 可用于设置 Drawer 内容部分的样式 | CSSProperties | - |  |
 | class | 对话框外层容器的类名 | string | - |  |
 | closable | 是否显示左上角的关闭按钮 | boolean | true |  |
-| closeIcon | 自定义关闭图标 | VNode \| slot | <CloseOutlined /> | 3.0.0 |
+| closeIcon | 自定义关闭图标 | VNode \| slot | `<CloseOutlined />` | 3.0.0 |
 | contentWrapperStyle | 可用于设置 Drawer 包裹内容部分的样式 | CSSProperties | - | 3.0.0 |
 | destroyOnClose | 关闭时销毁 Drawer 里的子元素 | boolean | false |  |
 | drawerStyle | 用于设置 Drawer 弹出层的样式 | object | - |  |