fix doc typo

Author: lbluque

docs/inorganic_materials/examples_tutorials/formation_energy.md

@@ -86,7 +86,7 @@ form_energy = atoms.get_potential_energy()
 ```
 
 ```{code-cell} ipython3
-pprint.pprint(f"Total energy: {result["results"]["energy"] eV\n Formation energy {form_energy} eV})
+pprint.pprint(f"Total energy: {result['results']['energy']} eV \n Formation energy {form_energy} eV")
 ```
 
 Compare the results to the value of [-3.038 eV/atom reported](https://next-gen.materialsproject.org/materials/mp-1265?chemsys=Mg-O#thermodynamic_stability) in the the Materials Project!