docs: `CityBuildingLayer` doc (#906)

* docs: refine `CityBuildingLayer` doc

* style: doc lint

docs/api/cityBuilding/cityBuilding.zh.md

@@ -5,6 +5,10 @@ order: 6
 
 `markdown:docs/common/style.md`
 
+## 简介
+
+`CityBuildingLayer` 用于构建城市建筑 3D 模型, 展示城市建筑
+
 ## 使用
 
 ```javascript
@@ -13,10 +17,14 @@ import { CityBuildingLayer } from '@antv/l7';
 
 ### animate
 
-开启动画效果
+是否开启动画效果, 仅支持`boolean` 或`enable: boolean` 配置项
 
 ```javascript
 layer.animate(true);
+
+layer.animatte({
+  enable: true,
+});
 ```
 
 ### style
@@ -38,35 +46,55 @@ layer.animate(true);
 
 ## 自定义动画频率
 
-自定义动画频率需要 关闭默认动画，通过 setLight 方法不断更新时间
-
-```javascript
-layer.animate(false);
-```
+自定义动画频率需要 关闭默认动画，通过 `setLight` 方法不断更新时间
 
 ### setLight(time)
 
 参数
 time : 时间 毫秒
 
+```js
+import { CityBuildingLayer } from '@antv/l7';
+
+const buildingLayer = new CityBuildingLayer();
+buildingLayer.animate(false);
+
+setInterval(() => {
+  buildingLayer.setLight(Date.now());
+}, 2000);
+```
+
 #### 完整代码
 
 ```javascript
-const pointLayer = new CityBuildingLayer();
-pointLayer
-  .source(await response.json())
-  .size('floor', [0, 500])
-  .color('rgba(242,246,250,1.0)')
-  .animate({
-    enable: true,
-  })
-  .style({
-    opacity: 1.0,
-    baseColor: 'rgb(16,16,16)',
-    windowColor: 'rgb(30,60,89)',
-    brightColor: 'rgb(255,176,38)',
+import { Scene, CityBuildingLayer } from '@antv/l7';
+import { GaodeMap } from '@antv/l7-maps';
+
+const scene = new Scene({
+  id: 'map',
+  map: new GaodeMap({
+    style: 'dark',
+    center: [120.173104, 30.244072],
+    pitch: 70.41138037735848,
+    zoom: 17.18,
+    rotation: 2.24, // 358.7459759480504
+    minZoom: 14,
+  }),
+});
+
+scene.on('loaded', () => {
+  fetch('https://gw.alipayobjects.com/os/rmsportal/ggFwDClGjjvpSMBIrcEx.json')
+    .then((res) => res.json())
+    .then((data) => {
+      const layer = new CityBuildingLayer({
+        zIndex: 0,
       });
-scene.addLayer(pointLayer);
+      layer.source(data);
+      scene.addLayer(layer);
+    });
+});
 ```
 
+<img src="https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*Fe40RYZYR0kAAAAAAAAAAAAAARQnAQ" alt="L7 建筑图层" height="300" width="300">
+
 `markdown:docs/common/layer/base.md`