'Qt Designer', and related documentation links, were renamed to 'Qt Widgets Designer'. Amends 8aceccc7eb075cef442dfe725137068d90e40940. Task-number: QTBUG-122253 Change-Id: I38d8b221716de59fe8faefbd4928eb1007e19b81 Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io> Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>