updated docs

Signed-off-by: Nwusongqing <wusongqing@huawei.com>

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

@@ -133,7 +133,7 @@ Triggers an event.
           // func1 is called,1,2
           this.context.eventHub.emit("123", 1, 2);
       }
-      func1(a: string, b: string) {
+      func1(a, b) {
           console.log("func1 is called," + a + "," + b);
       }
   }

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

 # Nonlinear Container LightWeightSet 
 
 > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
-> 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.
+> The initial APIs of this module are supported since API 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 
 
 ## Modules to Import
@@ -428,7 +428,7 @@ Uses a callback to traverse the entries in this container and obtain their posit
 callbackfn
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| value | T | Yes| Value of the entry that is currently traversed.|
+| value | T | No| Value of the entry that is currently traversed.|
 | key| T | No| Key of the entry that is currently traversed (same as **value**).|
 | set | LightWeightSet<T> | No| Instance that invokes the **forEach** method.|