!9153 【轻量级 PR】：【OpenHarmony开源贡献者计划2022】update zh-cn/application-dev/media/camera.md.示例代码for循环书写错误

Merge pull request !9153 from 王玉丰/N/A

zh-cn/application-dev/media/camera.md

@@ -54,7 +54,7 @@ await cameraManager.getCameras((err, cameras) => {
     cameraArray = cameras
 })
 
-for(let cameraIndex = 0; cameraIndex < cameraArray.length; cameraIndex) {
+for(let cameraIndex = 0; cameraIndex < cameraArray.length; cameraIndex++) {
     console.log('cameraId : ' + cameraArray[cameraIndex].cameraId)                          //获取相机ID
     console.log('cameraPosition : ' + cameraArray[cameraIndex].cameraPosition)              //获取相机位置
     console.log('cameraType : ' + cameraArray[cameraIndex].cameraType)                      //获取相机类型