update doc

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

en/application-dev/reference/apis/js-apis-resource-manager.md

@@ -307,7 +307,7 @@ Obtains the string corresponding to the specified resource ID. This API uses a p
 **Return value**
 | Type                   | Description         |
 | --------------------- | ----------- |
-| Promise<string> | String corresponding to the specified resource ID.|
+| Promise<string> | Promise used to return the result.|
 
 **Example**
   ```
@@ -486,7 +486,7 @@ Obtains the string array corresponding to the specified resource object. This AP
 **Return value**
 | Type                   | Description         |
 | --------------------- | ----------- |
-| Promise<Array<string>> | String array corresponding to the resource object.|
+| Promise<Array<string>> | Promise used to return the result.|
 
 **Example**
   ```
@@ -605,7 +605,7 @@ Obtains the content of the media file corresponding to the specified resource ob
 **Return value**
 | Type                   | Description         |
 | --------------------- | ----------- |
-| Promise<Uint8Array> | Media file content corresponding to the resource object.|
+| Promise<Uint8Array> | Promise used to return the result.|
 
 **Example**
   ```
@@ -724,7 +724,7 @@ Obtains the Base64 code of the image corresponding to the specified resource obj
 **Return value**
 | Type                   | Description                  |
 | --------------------- | -------------------- |
-| Promise<string> | Base64 code of the image corresponding to the specified resource object.|
+| Promise<string> | Promise used to return the result.|
 
 **Example**
   ```