[Fix] correct Guide article example for Iterate Through the Keys of an Object with a for...in Statement (#35197)

* fix: added dot btwn [user] and online

* fix: corrected example for other languages

guide/english/certifications/javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement/index.md

@@ -13,10 +13,10 @@ Method:
 ```javascript
 
 for (let user in obj) {
-    if(obj.user.online === true) {
-      //code
-    }
+  if(obj.user.online === true) {
+    //code
   }
+}
 
 ```
 
@@ -27,10 +27,10 @@ for (let user in obj) {
 ```javascript
 
 for (let user in obj) {
-    if(obj[user]online === true) {
-      //code
-    }
+  if(obj[user].online === true) {
+    //code
   }
+}
 
 ```