Update part1b.md

in-depth explanation for the immutability of const -> immutability applies to the binding, not the contents

Author: divywnzh

src/content/1/en/part1b.md

@@ -65,7 +65,7 @@ t.forEach(value => {
 })                    
 ```
 
-Notable in this example is the fact that the contents of the array can be modified even though it is defined as a _const_. Because the array is an object, the variable always points to the same object. However, the content of the array changes as new items are added to it.
+Notable in this example is the fact that although a variable declared with const cannot be reassigned to a different value, the contents of the object it references can still be modified. This is because the const declaration ensures the immutability of the reference itself, not the data it points to. Think of it like changing the furniture inside a house, while the address of the house remains the same.
 
 One way of iterating through the items of the array is using _forEach_ as seen in the example. _forEach_ receives a <i>function</i> defined using the arrow syntax as a parameter.