Correct typo in docstring

Author: caleb531

ica/core.py

@@ -254,7 +254,7 @@ def make_dataframe_tz_naive(df: pd.DataFrame) -> pd.DataFrame:
 def prepare_df_for_output(df: pd.DataFrame) -> pd.DataFrame:
     """
     Prepare the given dataframe for output by prettifying column names,
-    strippnig timezone details incompatible with Excel, and other normalization
+    stripping timezone details incompatible with Excel, and other normalization
     operations; return the normalized dataframe
     """
     return (