update docs

Signed-off-by: Nshawn_he <shawn.he@huawei.com>

en/application-dev/reference/apis/js-apis-hiappevent.md

 # HiAppEvent
 
+This module provides the application event logging functions, such as writing application events to the event file and managing the event logging configuration.
+
 > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**<br>
 > The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 

en/application-dev/reference/apis/js-apis-hitracechain.md

 # Distributed Call Chain Tracing
 
+This module implements call chain tracing throughout a service process. It provides functions such as starting and stopping call chain tracing and configuring trace points.
+
 > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**<br>
 > The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 

en/application-dev/reference/apis/js-apis-hitracemeter.md

 # Performance Tracing
 
+This module provides the functions of tracing service processes and monitoring the system performance. It provides the data needed for hiTraceMeter to carry out performance analysis.
+
 > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**<br>
 > The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 

en/application-dev/reference/apis/js-apis-update.md

@@ -134,11 +134,11 @@ Obtains the new version information. This function uses an asynchronous callback
 **Example**
 
 ```
-updater.getNewVersionInfo(info => {
+updater.getNewVersionInfo((err, info) => {
   console.log("getNewVersionInfo success  " + info.status);
-  console.log(`info versionName = ` + info.checkResult[0].versionName);
-  console.log(`info versionCode = ` + info.checkResult[0].versionCode);
-  console.log(`info verifyInfo = ` + info.checkResult[0].verifyInfo);
+  console.log(`info versionName = ` + info.checkResults[0].versionName);
+  console.log(`info versionCode = ` + info.checkResults[0].versionCode);
+  console.log(`info verifyInfo = ` + info.checkResults[0].verifyInfo);
 });
 ```
 
@@ -160,9 +160,9 @@ Obtains the new version information. This function uses a promise to return the
 
 ```
 updater.getNewVersionInfo().then(value => {
-  console.log(`info versionName = ` + value.checkResult[0].versionName);
-  console.log(`info versionCode = ` + value.checkResult[0].versionCode);
-  console.log(`info verifyInfo = ` + value.checkResult[0].verifyInfo);
+  console.log(`info versionName = ` + value.checkResults[0].versionName);
+  console.log(`info versionCode = ` + value.checkResults[0].versionCode);
+  console.log(`info verifyInfo = ` + value.checkResults[0].verifyInfo);
 }).catch(err => {
   console.log("getNewVersionInfo promise error: " + err.code);
 });
@@ -185,11 +185,11 @@ Checks whether the current version is the latest. This function uses an asynchro
 **Example**
 
 ```
-updater.checkNewVersion(info => {
+updater.checkNewVersion((err, info) => {
   console.log("checkNewVersion success  " + info.status);
-  console.log(`info versionName = ` + info.checkResult[0].versionName);
-  console.log(`info versionCode = ` + info.checkResult[0].versionCode);
-  console.log(`info verifyInfo = ` + info.checkResult[0].verifyInfo);
+  console.log(`info versionName = ` + info.checkResults[0].versionName);
+  console.log(`info versionCode = ` + info.checkResults[0].versionCode);
+  console.log(`info verifyInfo = ` + info.checkResults[0].verifyInfo);
 });
 ```
 
@@ -211,9 +211,9 @@ Checks whether the current version is the latest. This function uses a promise t
 
 ```
 updater.checkNewVersion().then(value => {
-  console.log(`info versionName = ` + value.checkResult[0].versionName);
-  console.log(`info versionCode = ` + value.checkResult[0].versionCode);
-  console.log(`info verifyInfo = ` + value.checkResult[0].verifyInfo);
+  console.log(`info versionName = ` + value.checkResults[0].versionName);
+  console.log(`info versionCode = ` + value.checkResults[0].versionCode);
+  console.log(`info verifyInfo = ` + value.checkResults[0].verifyInfo);
 }).catch(err => {
   console.log("checkNewVersion promise error: " + err.code);
 });
@@ -284,7 +284,7 @@ Reboots the device and clears the user partition data. This function uses a prom
 **Example**
 
 ```
-updater.rebootAndCleanUserData(result => {
+updater.rebootAndCleanUserData((err, result) => {
   console.log("rebootAndCleanUserData ", result)
 });
 ```
@@ -330,7 +330,7 @@ Installs the update package. This function uses a promise to return the result.
 **Example**
 
 ```
-updater.applyNewVersion(result => {
+updater.applyNewVersion((err, result) => {
   console.log("applyNewVersion ", result)
 });
 ```
@@ -399,7 +399,7 @@ let policy = {
   autoUpgradeInterval: [ 2, 3 ],
   autoUpgradeCondition: 2
 }
-updater.setUpdatePolicy(policy, result => {
+updater.setUpdatePolicy(policy, (err, result) => {
   console.log("setUpdatePolicy ", result)
 });
 ```
@@ -458,7 +458,7 @@ Obtains the update policy. This function uses an asynchronous callback to return
 **Example**
 
 ```
-updater.getUpdatePolicy(policy => {
+updater.getUpdatePolicy((err, policy) => {
   console.log("getUpdatePolicy success");
   console.log(`policy autoDownload = ` + policy.autoDownload);
   console.log(`policy autoDownloadNet = ` + policy.autoDownloadNet);