CLN: remove outdated _item_cache in comment

Author: chilin0525

pandas/core/internals/managers.py

@@ -1898,10 +1898,6 @@ def _consolidate_check(self) -> None:
         self._known_consolidated = True
 
     def _consolidate_inplace(self) -> None:
-        # In general, _consolidate_inplace should only be called via
-        #  DataFrame._consolidate_inplace, otherwise we will fail to invalidate
-        #  the DataFrame's internal structures. The exception is for newly-created
-        #  BlockManager objects not yet attached to a DataFrame.
         if not self.is_consolidated():
             self.blocks = _consolidate(self.blocks)
             self._is_consolidated = True

pandas/tests/internals/test_internals.py

@@ -735,8 +735,6 @@ def test_reindex_items(self):
         mgr = create_mgr("a: f8; b: i8; c: f8; d: i8; e: f8; f: bool; g: f8-2")
 
         reindexed = mgr.reindex_axis(["g", "c", "a", "d"], axis=0)
-        # reindex_axis does not consolidate_inplace, as that risks failing to
-        #  invalidate internal caches
         assert not reindexed.is_consolidated()
 
         tm.assert_index_equal(reindexed.items, Index(["g", "c", "a", "d"]))