Missing documentation of python class with decorators.

Describe the bug

When generating documentation for class with decorators, Sphinx recognizes the wrapped class as the wrapper function returned by the top decorator instead of the actual class being wrapped by decorators.

How to Reproduce

index.rst

.. automodule:: test_sphinx
    :members:
    :show-inheritance:
    :undoc-members:

test_sphinx.py

def Singleton(class_):
    """A singleton decorator"""
    instances = {}

    def getinstance(*args, **kwargs):
        if class_ not in instances:
            instances[class_] = class_(*args, **kwargs)
        return instances[class_]

    return getinstance

@Singleton
class Foo:
   """An example class."""

   def bar(self):
      """An example function."""
      pass

Environment Information

Platform:              Ubuntu 22.04;
Python version:        3.10.13 (GCC: (GNU) 4.8.5 20150623 (Red Hat 4.8.5-44).GCC: (GNU) 7.3.1 20180303 (Red Hat 7.3.1-5).)
Python implementation: CPython
Sphinx version:        5.3.0

Sphinx extensions

No response

Additional context

No response

Reproduce the issue with the index.rst directive and the decorated Foo class in test_sphinx.py under Python 3.10 and Sphinx 5.3.0. Compare the generated documentation with the wrapped class and its bar method, then identify the relevant autodoc behavior and add coverage for the expected class documentation. Done means the decorated class is documented as Foo rather than as the decorator's wrapper function.