Fix wrong signal names in documentation.
Fix wrong signal names in documentation.

Change-Id: I7926efa7a15859185a8990c850cc8407f8f45de6
Reviewed-by: Jerome Pasion <c10995d24f6b454503389e8d00d837aef038985d@digia.com>

kobolabs/qtlocation,kobolabs/qtlocation,kobolabs/qtlocation