Fix docstring (#1772)

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## Summary by CodeRabbit

- **Refactor**
- Improved code readability in the core functionality without altering
the logic or control flow.

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src/quacc/atoms/core.py

@@ -196,7 +196,6 @@ def check_charge_and_spin(
     Returns
     -------
     charge, multiplicity
-
     """
 
     charge = charge if charge is not None else get_charge_attribute(atoms)