fix url in qw_fmo notebook

Author: king-p3nguin

applications/chemistry/quantum_walk_fmo/quantum_walk_fmo.ipynb

@@ -410,7 +410,7 @@
    "source": [
     "## References\n",
     "\n",
-    "<a id='Portugal2025'>[1]</a>: [R. Portugal and J. K. Moqadam, Efficient circuit implementations of continuous-time quantum walks for quantum search, Entropy (Basel) 27, 454 (2025).](https://doi.org/10.3390/e27050454)\n",
+    "<a id='Portugal2025'>[1]</a>: [R. Portugal and J. K. Moqadam, Efficient circuit implementations of continuous-time quantum walks for quantum search, Entropy (Basel) 27, 454 (2025).](https://www.mdpi.com/1099-4300/27/5/454)\n",
     "\n",
     "<a id='Mohseni2008'>[2]</a>: [M. Mohseni, P. Rebentrost, S. Lloyd, and A. Aspuru-Guzik, Environment-assisted quantum walks in photosynthetic energy transfer, J. Chem. Phys. 129, 174106 (2008).](https://doi.org/10.1063/1.3002335)\n",
     "\n",