Fixed documentation of signals of PieSeries...
Fixed documentation of signals of PieSeries
qmlsignal documentation regarding added and removed signals fixed.
Change-Id: I6368397d1b55c896b7afa607376e94c985b0c237
Task-number: QTRD-3502
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>