Fixed #23688 -- Updated cached_property to preserve docstring of original function

django/utils/functional.py

@@ -51,6 +51,7 @@ class cached_property(object):
     """
     def __init__(self, func, name=None):
         self.func = func
+        self.__doc__ = getattr(func, '__doc__')
         self.name = name or func.__name__
 
     def __get__(self, instance, type=None):