Add official Python documentation links to core concepts (#9300)

- Add generator expressions official docs link
- Add inheritance official docs link
- Add iterators official docs link
- Add lists official docs link

Closes #9299

src/data/roadmaps/python/content/generator-expressions@jnLIVRrWxcX3yq3Op91Vr.md

@@ -4,5 +4,6 @@ Generator expressions are a concise way to create a generator using a single lin
 
 Visit the following resources to learn more:
 
+- [@official@Python Official Documentation on Generator Expressions](https://docs.python.org/3/tutorial/classes.html#generator-expressions)
 - [@article@Python Generator Expressions](https://www.pythontutorial.net/advanced-python/python-generator-expressions/)
 - [@article@List Comprehensions in Python and Generator Expressions](https://djangostars.com/blog/list-comprehensions-and-generator-expressions/)

src/data/roadmaps/python/content/inheritance@S0FLE70szSVUPI0CDEQK7.md

@@ -2,4 +2,6 @@
 
 Inheritance is a fundamental concept in object-oriented programming (OOP) that allows one class to inherit the properties and behavior of another class.
 
-Visit the following resources to learn more:
+Visit the following resources to learn more:
+
+- [@official@Python Official Documentation on Inheritance](https://docs.python.org/3/tutorial/classes.html#inheritance)

src/data/roadmaps/python/content/iterators@aB1LSQjDEQb_BxueOcnxU.md

@@ -4,5 +4,6 @@ An iterator is an object that contains a countable number of values. An iterator
 
 Visit the following resources to learn more:
 
+- [@official@Python Official Documentation on Iterators](https://docs.python.org/3/tutorial/classes.html#iterators)
 - [@article@Python Iterators](https://www.programiz.com/python-programming/iterator)
 - [@article@Iterators and Iterables in Python](https://realpython.com/python-iterators-iterables/)

src/data/roadmaps/python/content/lists@UT_SR7G-LYtzqooWrEtF1.md

@@ -10,6 +10,7 @@
 
 Visit the following resources to learn more:
 
+- [@official@Python Official Documentation on Listsc](https://docs.python.org/3/tutorial/introduction.html#lists)
 - [@article@Tuples vs. Lists vs. Sets in Python](https://jerrynsh.com/tuples-vs-lists-vs-sets-in-python/)
 - [@article@Python for Beginners: Lists](https://thenewstack.io/python-for-beginners-lists/)
 - [@article@Python for Beginners: When and How to Use Tuples](https://thenewstack.io/python-for-beginners-when-and-how-to-use-tuples/)