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

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

pandas/core/window/rolling.py

@@ -3527,6 +3527,7 @@ def corr(
 
 Rolling.__doc__ = Window.__doc__
 
+
 class RollingGroupby(BaseWindowGroupby, Rolling):
     """
     Provide a rolling groupby implementation.