[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

dpdata/abacus/relax.py

@@ -40,8 +40,7 @@ def get_relax_stru_files(output_dir):
 
     Returns
     -------
-        strus: list of STRU files
-
+    strus: list of STRU files
     example:
         ["STRU_ION1_D", "STRU_ION2_D"]
     """