updated linkedlist and vector apis

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

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

@@ -10,7 +10,7 @@
 import LinkedList from '@ohos.util.LinkedList'  
 ```
 
-## System Capabilities
+## System Capability
 
 SystemCapability.Utils.Lang
 
@@ -452,7 +452,7 @@ callbackfn
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the entry that is currently traversed.|
 | index | number | No| Position index of the entry that is currently traversed.|
-| LinkedList | LinkedList<T> | No| Instance that invokes the **forEach** method.|
+| LinkedList | LinkedList<T> | No| Instance that invokes the **forEach** API.|
 
 **Example**
 

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

@@ -10,7 +10,7 @@
 import Vector from '@ohos.util.Vector'  
 ```
 
-## System Capabilities
+## System Capability
 
 SystemCapability.Utils.Lang
 
@@ -284,7 +284,7 @@ callbackfn
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the entry that is currently traversed.|
 | index | number | No| Position index of the entry that is currently traversed.|
-| vector | Vector<T> | No| Instance that invokes the **replaceAllElements** method.|
+| vector | Vector<T> | No| Instance that invokes the **replaceAllElements** API.|
 
 **Example**
 
@@ -321,7 +321,7 @@ callbackfn
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the entry that is currently traversed.|
 | index | number | No| Position index of the entry that is currently traversed.|
-| vector | Vector<T> | No| Instance that invokes the **forEach** method.|
+| vector | Vector<T> | No| Instance that invokes the **forEach** API.|
 
 **Example**