Closes Issue #18442: fix typo (noticed by Févry Thibault).
Closes Issue #18442: fix typo (noticed by Févry Thibault).

jeff5/jython-devguide,jython/devguide,jython/devguide,ezio-melotti/devguide,jeff5/jython-devguide,jeff5/jython-devguide,jython/devguide