b6997e0917
Since commit39d334faa5(package/pkg-qmake: add <pkg>_SYNC_QT_HEADERS support), the qmake-package infra recognises said variable but the manual has the wrong variable name, which is missing the "_QT" part. We fix that by amending the manual to document the proper variable name. Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> (cherry picked from commitac2db5eb2e) Signed-off-by: Peter Korsgaard <peter@korsgaard.com>