Add more information on triangulate polygon

(cherry picked from commit bcc4d26)

doc/classes/Geometry.xml

@@ -332,7 +332,7 @@
 			<return type="PoolIntArray" />
 			<argument index="0" name="polygon" type="PoolVector2Array" />
 			<description>
-				Triangulates the polygon specified by the points in [code]polygon[/code]. Returns a [PoolIntArray] where each triangle consists of three consecutive point indices into [code]polygon[/code] (i.e. the returned array will have [code]n * 3[/code] elements, with [code]n[/code] being the number of found triangles). If the triangulation did not succeed, an empty [PoolIntArray] is returned.
+				Triangulates the polygon specified by the points in [code]polygon[/code]. Returns a [PoolIntArray] where each triangle consists of three consecutive point indices into [code]polygon[/code] (i.e. the returned array will have [code]n * 3[/code] elements, with [code]n[/code] being the number of found triangles). Output triangles will always be counter clockwise, and the contour will be flipped if it's clockwise. If the triangulation did not succeed, an empty [PoolIntArray] is returned.
 			</description>
 		</method>
 	</methods>