fix(curriculum): add section headers to loops lecture (#69747)

curriculum/challenges/english/blocks/lecture-working-with-loops/67329f7f3d1bd75c17896c66.md

@@ -13,6 +13,8 @@ An example of a loop would be when you are designing a program that needs to pri
 
 Another example would be when you are designing a game and you want to move a character across the screen. You could use a loop to move the character a certain number of pixels each time the loop runs. 
 
+## The `for` Loop Syntax
+
 In JavaScript, there are several types of loops that you can use. In this lesson, we will cover the `for` loop. Here is the basic syntax for a `for` loop:
 
 ```js
@@ -29,6 +31,8 @@ If the condition is true, the code block inside the loop is executed. If the con
 
 The last part of the loop is the increment/decrement statement. This statement is executed after each iteration of the loop. It is typically used to increment or decrement the counter variable.
 
+## A `for` Loop Example
+
 :::interactive_editor
 
 ```js
@@ -51,8 +55,12 @@ Then we check the condition again which is to check if `i` is less than `5`. Sin
 
 We keep repeating this process until the condition is false. In this case, when `i` is `5`, the condition is false, and the loop stops.
 
+## Infinite Loops
+
 When you're working with loops you should be careful not to create a condition that is always true. If you do, the loop will run forever and your program will crash. This is known as an infinite loop.
 
+## Nested Loops
+
 It is possible to create nested `for` loops. A nested loop is when you place one loop inside of another. We will see examples of when you might want to do this later on.
 
 Loops can be beneficial in programming when you need to repeat a block of code a certain number of times. Even though working with `for` loops can be tricky at first,  with practice you will get the hang of it.