Fix XAccessibleSelection::getSelectedAccessibleChild doc

The valid indices to pass as params to
`XAccessibleSelection::getSelectedAccessibleChild`
depend on the the number of selected children, i.e. the
return value of
`XAccessibleSelection::getSelectedAccessibleChildCount`.

The previously mentioned
`XAccessibleRelationSet::getAccessibleChildCount`
doesn't even exist.

Change-Id: Iaabbc9e3972c7a8274495e19978db9eae36077fa
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/166466
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions