Add missing terminators + other corrections (#23502)

* Add missing terminators + other corrections

Missing terminators were added and for loop formatting was corrected. Even though terminators are optional, they can often confuse beginners. Also, a typo and a grammatical error was corrected.

* fix: formatting

guide/english/javascript/loops/for-in-loop/index.md

@@ -1,11 +1,12 @@
 ---
 title: For...In Loop
 ---
-The `for...in` statement iterates over the enumerable properties of an object, in arbitrary order. For each distinct property, statements can be executed.
-
+The `for...in` statement iterates over the enumerable properties of an object, in an arbitrary order. For each distinct property, statements can be executed.
+```js
 for (variable in object) {
   ...
 }
+```
 
 | Required/Optional | Parameter | Description |
 |-------------------|-----------|----------------------------------------------------------------------|
@@ -15,12 +16,12 @@ The `for...in` statement iterates over the enumerable properties of an object, i
 
 
 ## Examples
-
+```js
 // Initialize object.
-    a = { "a": "Athens", "b": "Belgrade", "c": "Cairo" }
+var a = { "a": "Athens", "b": "Belgrade", "c": "Cairo" };
 
 // Iterate over the properties.
-    var s = ""
+var s = "";
 for (var key in a) {
     s += key + ": " + a[key];
     s += "<br />";
@@ -65,7 +66,7 @@ The `for...in` statement iterates over the enumerable properties of an object, i
 //   a
 //   b
 //   c
-
-# Ohter Resources:
+```
+## Other Resources:
 * [MDN link](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in)
 * [MSDN link](https://msdn.microsoft.com/library/55wb2d34.aspx)