updating the docs

Author: mattleibow

docs/en/SkiaSharp/SK3dView.xml

@@ -12,11 +12,6 @@
     <BaseTypeName>SkiaSharp.SKObject</BaseTypeName>
   </Base>
   <Interfaces />
-  <Attributes>
-    <Attribute>
-      <AttributeName>System.Obsolete("Use SKMatrix44 instead.", true)</AttributeName>
-    </Attribute>
-  </Attributes>
   <Docs>
     <summary>A utility class that can be used to create 3D transformations.</summary>
     <remarks>