Fix typo

Change-Id: Ia182da4c6f364d302ca189a10a7e9619211770cc
Reviewed-on: https://gerrit.libreoffice.org/66247
Tested-by: Jenkins
Reviewed-by: Jens Carl <j.carl43@gmx.de>

chart2/source/model/template/ChartTypeTemplate.cxx

@@ -711,7 +711,7 @@ void ChartTypeTemplate::createAxes(
 void ChartTypeTemplate::adaptAxes(
     const Sequence< Reference< XCoordinateSystem > > & rCoordSys )
 {
-    //adapt properties of exsisting axes and remove superfluous axes
+    //adapt properties of existing axes and remove superfluous axes
 
     if( rCoordSys.getLength() > 0 )
     {