chore: sync content to repo (#10204)

Co-authored-by: nilbuild <4921183+nilbuild@users.noreply.github.com>

roadmaps/python/content/functions-builtin-functions@-DJgS6l2qngfwurExlmmT.md

@@ -7,4 +7,5 @@ Visit the following resources to learn more:
 - [@official@Built-in Functions in Python](https://docs.python.org/3/library/functions.html)
 - [@article@Defining Python Functions](https://realpython.com/defining-your-own-python-function/)
 - [@article@How to Return Multiple Values in Python (and When to Use Each Method)](https://roadmap.sh/python/return-multiple-values)
-- [@article@Master Python Filter: Syntax, Examples, and Best Practices](https://roadmap.sh/python/filter)
+- [@article@Master Python Filter: Syntax, Examples, and Best Practices](https://roadmap.sh/python/filter)
+- [@article@Python reduce(): The Complete Guide (With Examples)](https://roadmap.sh/python/reduce)