[Sync EN] Fix changelog row markup in DateInterval::createFromDateString (#5604)

[github-actions]

Commit: https://github.com/php/doc-en/commit/82f00c8d4d4f09fa5a363bc0c6f48e0c80eea72d
PR: https://github.com/php/doc-en/pull/5604

Zu aktualisierende DE-Dateien

• reference/datetime/dateinterval/createfromdatestring.xml