The docs said only the first placeholder would be considered; in fact,
it considers only the last.
Fix the docs and add a test (also for QTemporaryDir).
Amends b4bb4449aea7592afdb9b9134bb90c40fe29735a.
While 6.6 and earlier are unaffected by the incorrect documentation,
pick this to all active branches in order to verify the behavior is
the same everywhere.
Pick-to: 6.9 6.8 6.5 6.2 5.15
Fixes: QTBUG-132597
Change-Id: Ia7a37f714f834191b07420d31ca9024702b537cc
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
e7abbc7bf3