Update pennylane/qchem/openfermion_obs.py

Co-authored-by: Utkarsh <utkarshazad98@gmail.com>

pennylane/qchem/openfermion_obs.py

@@ -697,7 +697,7 @@ def molecular_dipole(
  where :math:`Z_i` and :math:`{\bf R}_i` denote, respectively, the atomic number and the
  nuclear coordinates of the :math:`i`-th atom of the molecule.
 
- The fermonic dipole operator is then transformed to the qubit basis which gives
+ The fermionic dipole operator is then transformed to the qubit basis, which gives
 
  .. math::