#11647 fix template typo

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Scope and purpose

Fixes #11647

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• The title of the PR should describe the changes and starts with the associated issue number, like “#9782 Remove twisted.news. #1234 Brief description”.
• A release notes news fragment file was create in src/twisted/newsfragments/ (see: Release notes fragments docs.)
• The automated tests were updated.
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needs-review

[adiroiban]

Thanks.

Maybe while at it

-* Once all checks are green, request a review by leaving a comment that contains exactly the string `needs-review`.
+* Once all checks are green, request a review by leaving a comment that contains exactly the string `please review`.

Not sure what is the preferred trigger workd

The current bot works with:

• needs-review
• please review
• review please

But I think it fails if there is full stop at the end.

[adiroiban]

There was a flaky test :(

re-run trigerred

twisted.trial.unittest.FailTest: 1 != 0 : Warnings found at the end of the test:
[{'message': 'unclosed event loop <_UnixSelectorEventLoop running=False closed=False debug=False>', 'category': <class 'ResourceWarning'>, 'filename': '/opt/hostedtoolcache/Python/3.9.13/x64/lib/python3.9/asyncio/base_events.py', 'lineno': 686}]

twisted.internet.test.test_posixbase.WakerTests.test_noWakerConstructionWarnings