docs: Fixed typo in changelog.

Author: minrk

docs/reference/changelog.rst

@@ -4,7 +4,7 @@ Changelog
 
 0.26.0 (UNRELEASED)
 ===================
-- Adds configuration option that sets default event loop scope for all testss `#793 <https://github.com/pytest-dev/pytest-asyncio/issues/793>`_
+- Adds configuration option that sets default event loop scope for all tests `#793 <https://github.com/pytest-dev/pytest-asyncio/issues/793>`_
 - Improved type annotations for ``pytest_asyncio.fixture`` `#1045 <https://github.com/pytest-dev/pytest-asyncio/pull/1045>`_
 - Added ``typing-extensions`` as additional dependency for Python ``<3.10`` `#1045 <https://github.com/pytest-dev/pytest-asyncio/pull/1045>`_