update docs

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

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

@@ -97,7 +97,7 @@ Checks the screen status of the current device.
 **Return Value**
 | Type                    | Description                                     |
 | ---------------------- | --------------------------------------- |
-| Promise&lt;boolean&gt; | Promise used to asynchronously obtain the return value. <br/>Return value: The value **true** indicates that the screen is on, and the value **false** indicates the opposite.|
+| Promise&lt;boolean&gt; | Promise used to obtain the return value. <br/>Return value: The value **true** indicates that the screen is on, and the value **false** indicates the opposite.|
 
 **Example**
 

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

@@ -21,7 +21,7 @@ Enumerates the types of **RunningLock** objects.
 
 | Name                      | Default Value  | Description                 |
 | ------------------------ | ---- | ------------------- |
-| BACKGROUND               | 1    | Defines a **RunningLock** object.          |
+| BACKGROUND               | 1    | A lock that prevents the system from hibernating when the screen is off.|
 | PROXIMITY_SCREEN_CONTROL | 2    | A lock that determines whether to turn on or off the screen based on the distance away from the screen.|