Update README.md

Signed-off-by: Fabiana 🚀  Campanari <113218619+FabianaCampanari@users.noreply.github.com>

Author: FabianaCampanari

README.md

@@ -561,9 +561,9 @@ After running Solver:
 
 <br>
 
-## Extras Excercise:
+# Extras Excercise:
 
-## 1- 📊 Linear Programming Mathematical Model — Production Optimization
+## 1- 📊 [Linear Programming Mathematical Model — Production Optimization]()
 
 ### ✅ Problem Statement
 
@@ -746,7 +746,7 @@ x_1 \geq 0, \quad x_2 \geq 0
 
 <br>
 
-## 2- 📈 Graphical Solution to the Linear Programming (LP) Problem
+## 2- 📈 [Graphical Solution to the Linear Programming (LP) Problem]():
 
 **Objective:**