fix(curriculum): add brief explanation for decorators in getters and setters lesson (#65888)

Co-authored-by: Dario <105294544+Dario-DC@users.noreply.github.com>

curriculum/challenges/english/blocks/lecture-understanding-object-oriented-programming-and-encapsulation/68c128cbd77e4ba9ed671937.md

@@ -21,7 +21,9 @@ When you use a method, you always have to call it with parentheses. But with a p
 
 For example, you might want to calculate a value or check that a new value is valid before saving it. Instead of calling a method for that, you can use an attribute-like way to do that.
 
-To create a property, you define a method and place the `@property` decorator above it. This tells Python to treat the method as a property.
+In Python, a decorator is a function that modifies the functionalities of other functions, or classes, without changing their original code.
+
+While it is possible to create custom decorators, this is beyond the scope of this lesson. Just know that to create a property, you define a method and place the `@property` decorator above it. This turns the method into a property, so it can be accessed like an attribute while internally calling the decorated method.
 
 That takes us to getters. Here's how to create one with the `@property` decorator: