modify deviceSettingsManager doc

Signed-off-by: Nfangyun <fangyun2@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-enterprise-device-manager.md

@@ -459,7 +459,7 @@ enterpriseDeviceManager.isSuperAdmin(bundleName).then((result) => {
 
 getDeviceSettingsManager(callback: AsyncCallback<DeviceSettingsManager>): void
 
-获取DeviceSettingsManager对象，使用callback形式返回DeviceSettingsManager对象。
+获取[DeviceSettingsManager](js-apis-enterpriseDeviceManager-DeviceSettingsManager)对象，使用callback形式返回DeviceSettingsManager对象。
 
 **系统能力：** SystemCapability.Customization.EnterpriseDeviceManager
 
@@ -495,7 +495,7 @@ enterpriseDeviceManager.getDeviceSettingsManager((error, mgr) => {
 
 getDeviceSettingsManager(): Promise<DeviceSettingsManager>
 
-获取DeviceSettingsManager对象，使用Promise形式返回DeviceSettingsManager对象。
+获取[DeviceSettingsManager](js-apis-enterpriseDeviceManager-DeviceSettingsManager)对象，使用Promise形式返回DeviceSettingsManager对象。
 
 **系统能力：** SystemCapability.Customization.EnterpriseDeviceManager
 

zh-cn/application-dev/reference/apis/js-apis-enterpriseDeviceManager-DeviceSettingsManager.md

@@ -41,7 +41,7 @@ let wantTemp = {
 };
 enterpriseDeviceManager.getDeviceSettingsManager().then((mgr) => {
     mgr.setDateTime(wantTemp, 1526003846000, (error, value) => { 
-        if (error != null) {
+        if (error) {
             console.log(error);
         } else {
             console.log(value);
@@ -52,7 +52,7 @@ enterpriseDeviceManager.getDeviceSettingsManager().then((mgr) => {
 })
 ```
 
-## eDeviceSettingsManager.setDateTime
+## DeviceSettingsManager.setDateTime
 
 setDateTime(admin: Want, time: number): Promise<void>;