fix comments part II

Author: topper-123

pandas/core/indexes/numeric.py

@@ -15,7 +15,6 @@
 from pandas._typing import (
     Dtype,
     DtypeObj,
-    final,
 )
 from pandas.util._decorators import (
     cache_readonly,
@@ -269,15 +268,6 @@ def _assert_safe_casting(cls, data, subarr):
         """
         pass
 
-    @final
-    @cache_readonly
-    def _can_hold_na(self) -> bool:
-        if is_integer_dtype(self.dtype):
-            return False
-        else:
-            return True
-
-    @final
     @property
     def _is_all_dates(self) -> bool:
         """