Fix typo

Change-Id: I47295a5dee2ca95e36934ac74dc90f95912dc605
Reviewed-on: https://gerrit.libreoffice.org/70636Reviewed-by: himajin100000 <himajin100000@gmail.com>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>

chart2/source/view/main/Clipping.cxx

@@ -257,7 +257,7 @@ void Clipping::clipPolygonAtRectangle( const drawing::PolyPolygonShape3D& rPolyg
             aTo = getPointFromPoly(rPolygon,nOldPoint,nOldPolyIndex);
             if( lcl_clip2d_(aFrom, aTo, rRectangle) )
             {
-                // compose an Polygon of as many consecutive points as possible
+                // compose a Polygon of as many consecutive points as possible
                 if(aFrom == aLast)
                 {
                     if( aTo != aFrom )