[Improvement] Reorganize document (#1066)

packages/loading/en-US.md

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+## Loading
+
+### Install
+``` javascript
+import { Loading } from 'vant';
+
+Vue.use(Loading);
+```
+
+### Usage
+
+#### Circular
+
+```html
+<van-loading color="black" />
+<van-loading color="white" />
+```
+
+#### Spinner
+
+```html
+<van-loading type="spinner" color="black" />
+<van-loading type="spinner" color="white" />
+```
+
+### API
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| color | Can be set to `black` `white` | `String` | `black` |  |
+| type | Can be set to `circular` `spinner` | `String` | `circular` |
+| size | Size | `String` | `30px` |

packages/loading/zh-CN.md

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+## Loading 加载
+
+### 使用指南
+``` javascript
+import { Loading } from 'vant';
+
+Vue.use(Loading);
+```
+
+### 代码演示
+
+#### Circular
+
+```html
+<van-loading color="black" />
+<van-loading color="white" />
+```
+
+#### Spinner
+
+```html
+<van-loading type="spinner" color="black" />
+<van-loading type="spinner" color="white" />
+```
+
+### API
+
+| 参数 | 说明 | 类型 | 默认值 |
+|-----------|-----------|-----------|-------------|
+| color | 颜色，可选值为 `block` `white` | `String` | `black` |
+| type | 类型，可选值为 `circular` `spinner` | `String` | `circular` |
+| size | 大小 | `String` | `30px` |