Deprecation texts

Author: hannesa2

chartLib/src/main/kotlin/info/appdev/charting/charts/Chart.kt

@@ -945,7 +945,7 @@ abstract class Chart<T : ChartData<out IDataSet<out Entry>>> : ViewGroup, IBaseP
         setMarkers(mutableListOf(marker))
     }
 
-    @Deprecated("")
+    @Deprecated("Use 'setMarker()' instead")
     fun setMarkerView(iMarker: IMarker) {
         setMarker(iMarker)
     }

chartLib/src/main/kotlin/info/appdev/charting/charts/PieChart.kt

@@ -339,7 +339,7 @@ open class PieChart : PieRadarChartBase<PieData> {
     /**
      * This will throw an exception, PieChart has no XAxis object.
      */
-    @Deprecated("")
+    @Deprecated("PieChart has no XAxis")
     override val xAxis: XAxis
         get() = throw RuntimeException("PieChart has no XAxis")