Update qmb/hubbard.py

Co-authored-by: Copilot <[email protected]>

Author: hzhangxyz

qmb/hubbard.py

@@ -38,7 +38,7 @@ class ModelConfig:
     def __post_init__(self) -> None:
         if self.electron_number is None:
             self.electron_number = self.m * self.n
-            logging.info("Electron number is not specified, set to half filling(one electron per lattice site) %d", self.electron_number)
+            logging.info("Electron number is not specified, set to half-filling (one electron per lattice site) %d", self.electron_number)
 
         if self.m <= 0 or self.n <= 0:
             raise ValueError("The dimensions of the Hubbard model must be positive integers.")