fix doc build path
fix doc build path

Task-number: QTBUG-34456
Change-Id: I8b2207e9419bda7fb95785f26370e451248e3ee2
Reviewed-by: Topi Reiniö <92400b03a70fe3119347f89b476f73d34ae93598@digia.com>
Reviewed-by: Jerome Pasion <c10995d24f6b454503389e8d00d837aef038985d@digia.com>

kobolabs/qtactiveqt,kobolabs/qtactiveqt