update for device Descriptors ,focus type and Sample format

Signed-off-by: Njiao_yanlin <jiaoyanlin@huawei.com>

zh-cn/application-dev/media/stream-manager.md

+## 开发指导
+1. 获取流管理器。
+
+    const audioStreamManager = audio.getStreamManager();
+    
+2. 获取当前音频渲染器流信息。
+
+```
+audioStreamManager.getCurrentAudioRendererInfoArray(async (err, AudioRendererChangeInfoArray) => {
+    console.info('[GET_RENDERER_STATE_1_CALLBACK] **** Get Callback Called ****');
+    if (err) {
+        console.log('getCurrentAudioRendererInfoArray :ERROR: '+err.message);
+        resultFlag = false;
+    }
+    else {
+        if (AudioRendererChangeInfoArray !=null) {
+            for (let i=0;i<AudioRendererChangeInfoArray.length;i++) {
+                AudioRendererChangeInfo = AudioRendererChangeInfoArray[i];
+                console.info('StreamId for '+i+' is:'+AudioRendererChangeInfo.streamId);
+                console.info('ClientUid for '+i+' is:'+AudioRendererChangeInfo.clientUid);
+                console.info('Content '+i+' is:'+AudioRendererChangeInfo.rendererInfo.content);
+                console.info('Stream'+i+' is:'+AudioRendererChangeInfo.rendererInfo.usage);
+                console.info('Flag'+i+' is:'+AudioRendererChangeInfo.rendererInfo.rendererFlags); 
+                console.info('State for '+i+' is:'+AudioRendererChangeInfo.rendererState);
+
+                var devDescriptor = AudioRendererChangeInfo.deviceDescriptors;
+                for (let j=0;j<AudioRendererChangeInfo.deviceDescriptors.length; j++) {
+                    console.info('Id:'+i+':'+AudioRendererChangeInfo.deviceDescriptors[j].id);
+                    console.info('Type:'+i+':'+AudioRendererChangeInfo.deviceDescriptors[j].deviceType);
+                    console.info('Role:'+i+':'+AudioRendererChangeInfo.deviceDescriptors[j].deviceRole);
+                    console.info('Name:'+i+':'+AudioRendererChangeInfo.deviceDescriptors[j].name);
+                    console.info('Address:'+i+':'+AudioRendererChangeInfo.deviceDescriptors[j].address);
+                    console.info('SampleRates:'+i+':'+AudioRendererChangeInfo.deviceDescriptors[j].sampleRates[0]);
+                    console.info('ChannelCount'+i+':'+AudioRendererChangeInfo.deviceDescriptors[j].channelCounts[0]);
+                    console.info('ChannelMask:'+i+':'+AudioRendererChangeInfo.deviceDescriptors[j].channelMasks);
+                }
+            }
+        }
+    }
+});
+```
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