Remove known bugs notice about 2D skeletons on Android

The 2D skeleton skinning path has been rewritten in 3.2.4 and should
now correctly work on Android.

tutorials/animation/2d_skeletons.rst

@@ -3,11 +3,6 @@
 2D skeletons
 ============
 
-.. warning::
-
-    There are known issues with 2D skeletons on mobile and web platforms with the GLES2 renderer. We
-    recommend using the GLES3 renderer if your project relies on Skeleton2D for now.
-
 Introduction
 ------------