docs: update v1.3.0 release notes with yesterday’s refactors

Author: Tanu-N-Prabhu

Release Notes/v1.3.0.md

@@ -64,6 +64,16 @@
   - Moved HackerRank exercise files into the main **`Python/`** folder  
   - Aligned external practice problems with the repository’s learning structure  
   - Improved discoverability of practice material for learners
+
+* **Refactored:** Removed duplicate practice material  
+  - Deleted the **Built-in Functions Practice Problems** file  
+  - Retained the canonical version inside **Python Exercises** to avoid duplication
+
+* **Refactored:** Improved and reorganized variable scope documentation  
+  - Fixed typos in the **Global and Local Variables** notebook  
+  - Moved the notebook into **`01_Python_Basics`**  
+  - Improved accuracy, readability, and placement of foundational Python concepts
+
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