docs: fix typo

Co-authored-by: John Paul E. Balandan, CPA <[email protected]>

Author: kenjis

user_guide_src/source/changelogs/v4.2.7.rst

@@ -12,7 +12,7 @@ Release Date: Unreleased
 BREAKING
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--  ``Time::__toStrong()`` is now locale-independent. It returns database-compatible strings like '2022-09-07 12:00:00' in any locale.
+-  ``Time::__toString()`` is now locale-independent. It returns database-compatible strings like '2022-09-07 12:00:00' in any locale.
 
 Enhancements
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