Update README.md

Signed-off-by: Fabiana 🚀  Campanari <[email protected]>

Author: FabianaCampanari

README.md

@@ -31,7 +31,7 @@ Feel free to explore, contribute, and share your insights!
 
 ## Table of Contents
 
-### [Predecessors of Quantum Mechanics](#predecessors-of-quantum-mechanics) – Key Mathematicians and Their Contributions
+#### [Predecessors of Quantum Mechanics](#predecessors-of-quantum-mechanics) – Key Mathematicians and Their Contributions
 1. **Leonhard Euler (1748)**  
 2. **Carl Friedrich Gauss (1809)**  
 3. **Joseph Fourier (1822)**