Update README.md

Author: Mohammed-3tef

Student Management System/README.md

@@ -50,7 +50,7 @@ The **Student Management System** is a Java-based console application designed t
 
 ## UML Diagram
 
-For a detailed UML class diagram of the project, refer to [UML_Diagram.md](https://github.com/Mohammed-3tef/Student_Management_System/blob/main/UML%20Diagram.md).
+For a detailed UML class diagram of the project, refer to [UML_Diagram.md](https://github.com/Mohammed-3tef/Java-Projects-Collections/blob/main/Student%20Management%20System/UML%20Diagram.md).
 
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@@ -113,4 +113,4 @@ The system ensures all inputs are valid:
 
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-## Enjoy managing your students with ease! 🚀
+## Enjoy managing your students with ease! 🚀