`Doc/howto/descriptor.rst` has a warning during doctest run

[sobolevn]

Bug report

Warning:

Document: howto/descriptor
--------------------------
1 items passed all tests:
173 tests in default
173 tests in 1 items.
173 passed and 0 failed.
Test passed.
Exception ignored in: <sqlite3.Connection object at 0x7f8ea14d0d10>
Traceback (most recent call last):
File "/home/runner/work/cpython/cpython/Doc/venv/lib/python3.13/site-packages/docutils/nodes.py", line 387, in __new__
def __new__(cls, data, rawsource=None):
ResourceWarning: unclosed database in <sqlite3.Connection object at 0x7f8ea14d0d10>

I propose adding:

.. testcleanup::

   conn.close()

To silence it.

Linked PRs

• gh-111724: Fix doctest ResourceWarning in howto/descriptor.rst #111725
• [3.12] gh-111724: Fix doctest ResourceWarning in howto/descriptor.rst (GH-111725) #111727
• [3.11] gh-111724: Fix doctest ResourceWarning in howto/descriptor.rst (GH-111725) #111728

[terryjreedy]

I presume you and @erlend-aasland wanted the backports merged and want the issue closed.