fix comments

Author: topper-123

doc/source/whatsnew/v2.1.0.rst

@@ -20,7 +20,7 @@ Reductions maintain extension dtypes
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 In previous versions of pandas, the results of DataFrame reductions
-(:meth:`DataFrameG.sum` :meth:`DataFrame.mean` etc.) has numpy dtypes even when the DataFrames
+(:meth:`DataFrame.sum` :meth:`DataFrame.mean` etc.) has numpy dtypes even when the DataFrames
 were of extension dtypes. Pandas can now keep the dtypes when doing reductions over Dataframe
 columns with a common dtype (:issue:`52788`).
 

pandas/core/arrays/base.py

@@ -1461,7 +1461,7 @@ def _reduce_and_wrap(self, name: str, *, skipna: bool = True, kwargs):
         Length: 1, dtype: Int64
         """
         result = self._reduce(name, skipna=skipna, **kwargs)
-        return np.array([[result]])
+        return np.array([result])
 
     # https://github.com/python/typeshed/issues/2148#issuecomment-520783318
     # Incompatible types in assignment (expression has type "None", base class