docs: update v1.3.0 release notes with additional refactors

Author: Tanu-N-Prabhu

Release Notes/v1.3.0.md

@@ -34,7 +34,6 @@
 
 ### Refactor
 
-
 * **Refactored**: Standardized Python learning folder structure
   - Renamed `Src` to `01_Python_Basics` for improved beginner clarity
   - Renamed and corrected the `Exercise` folder to `02_Python_Exercises_And_Practice`
@@ -54,7 +53,17 @@
   - Removed the standalone `Lists` folder to eliminate duplication  
   - Improved conceptual grouping of core Python data structures  
   - Simplified navigation for beginners
-
+  
+* **Refactored:** Consolidated core data structure examples into Python Basics  
+  - Moved String-related notebooks into **`01_Python_Basics`**  
+  - Moved Tuple-related notebooks into **`01_Python_Basics`**  
+  - Improved conceptual grouping of fundamental Python topics  
+  - Reduced fragmentation of beginner-level content
+
+* **Refactored:** Reorganized HackerRank exercises under Python directory  
+  - 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
 ---