proxy filter example issue

[weinrich15]

back-link: ch02/index.html#get-started

Example shows... proxy->setFilterCaseSensitive(Qt::CaseInsensitive); proxy->setFilterFixedString(QString)

Both lines produce errors.
should be: proxy->setFilterCaseSensitivity(Qt::CaseInsensitive); setFilterFixedString() line can be removed, its not needed.