Added Info About ForEach() Method (#34133)

Added a section on the very commonly used forEach() method for arrays. Also improved sentence structure of previous sentences.

guide/english/typescript/array-type/index.md

@@ -21,7 +21,7 @@ let names: Array<string> = ['Javier', 'Emma', 'John', 'Sophia', 'Emma'];
 
 ## Built-in methods
 In Typescript's Array type you can use some built-in functions. Each type has common and unique methods.
-Below you can read about the most used ones of the array type's methods. In the example, we will use the array declaration from above.
+Below you can read about the most used methods of the Array type. In the example, we will use the array declaration from above.
 
 ### pop()
 Removes the last element from an array and returns with it.
@@ -50,4 +50,15 @@ var reverseNames = names.reverse();
 //reverseNames = ['Emma','Sophia','John','Emma','Javier']
 ```
 
+### forEach()
+Perform a designated task for every item in the array
+```typescript
+var exclamationPointNames = names.forEach(doSomething);
+//doSomething = function (name: string, index: number) {
+//  name[i] = name[i] + "!";
+//}
+//exclamationPointNames = ['Emma!','Sophia!','John!','Emma!','Javier!']
+```
+
+
 [More methods and description at TutorialsPoint](https://www.tutorialspoint.com/typescript/typescript_arrays.htm)