CLN: remove _shared_docs

Author: HH-MWB

pandas/core/base.py

@@ -4,7 +4,7 @@
 
 import builtins
 import textwrap
-from typing import Dict, FrozenSet, List, Optional, Union
+from typing import FrozenSet, List, Optional, Union
 
 import numpy as np
 
@@ -36,7 +36,6 @@
 from pandas.core.construction import create_series_with_explicit_dtype
 import pandas.core.nanops as nanops
 
-_shared_docs: Dict[str, str] = dict()
 _indexops_doc_kwargs = dict(
     klass="IndexOpsMixin",
     inplace="",