[docs] Fixed typo.

Signed-off-by: Michael Seifert <[email protected]>

Author: seifertm

docs/source/reference/changelog.rst

@@ -7,7 +7,7 @@ Changelog
 - Output a proper error message when an invalid ``asyncio_mode`` is selected.
 - Extend warning message about unclosed event loops with additional possible cause.
   `#531 <https://github.com/pytest-dev/pytest-asyncio/issues/531>`_
-- Previously, some tests reported "skipped" or "xfailed" as a result. Now all tests report a "success" results.
+- Previously, some tests reported "skipped" or "xfailed" as a result. Now all tests report a "success" result.
 
 0.21.0 (2023-03-19)
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