!16815 Fix avsession docs, audioManager->audioRoutingManager

Merge pull request !16815 from Li Yuhang/fix_avsession_docs_0403

zh-cn/application-dev/reference/apis/js-apis-avsession.md

@@ -441,8 +441,9 @@ castAudio(session: SessionToken | 'all', audioDevices: Array<audio.AudioDeviceDe
 import audio from '@ohos.multimedia.audio';
 
 let audioManager = audio.getAudioManager();
+let audioRoutingManager = audioManager.getRoutingManager();
 let audioDevices;
-await audioManager.getDevices(audio.DeviceFlag.OUTPUT_DEVICES_FLAG).then((data) => {
+await audioRoutingManager.getDevices(audio.DeviceFlag.OUTPUT_DEVICES_FLAG).then((data) => {
     audioDevices = data;
     console.info('Promise returned to indicate that the device list is obtained.');
 }).catch((err) => {
@@ -493,8 +494,9 @@ castAudio(session: SessionToken | 'all', audioDevices: Array<audio.AudioDeviceDe
 import audio from '@ohos.multimedia.audio';
 
 let audioManager = audio.getAudioManager();
+let audioRoutingManager = audioManager.getRoutingManager();
 let audioDevices;
-await audioManager.getDevices(audio.DeviceFlag.OUTPUT_DEVICES_FLAG).then((data) => {
+await audioRoutingManager.getDevices(audio.DeviceFlag.OUTPUT_DEVICES_FLAG).then((data) => {
     audioDevices = data;
     console.info('Promise returned to indicate that the device list is obtained.');
 }).catch((err) => {