Drop unmaintained disclaimer

tutorial/source/normalizing_flows_intro.ipynb

@@ -8,7 +8,7 @@
     "\n",
     "This tutorial introduces Pyro's built-in normalizing flows. It is independent of most of Pyro, but users may want to read about distribution shapes in the [Tensor Shapes Tutorial](http://pyro.ai/examples/tensor_shapes.html).\n",
     "\n",
-    "> The development of Pyro's built-in flows has stopped in favor of external libraries, such as [Zuko](https://github.com/probabilists/zuko), [nflows](https://github.com/bayesiains/nflows), [normflows](https://github.com/VincentStimper/normalizing-flows) or [FlowTorch](https://github.com/stefanwebb/flowtorch). Some of these libraries may no longer be actively maintained or may have interfaces that are not directly compatible with Pyro. For example usages of [Zuko](https://github.com/probabilists/zuko) within Pyro, see [svi_flow_guide.ipynb](svi_flow_guide.ipynb) and [vae_flow_prior.ipynb](vae_flow_prior.ipynb).\n",
+    "> The development of Pyro's built-in flows has stopped in favor of external libraries, such as [Zuko](https://github.com/probabilists/zuko), [nflows](https://github.com/bayesiains/nflows), [normflows](https://github.com/VincentStimper/normalizing-flows) or [FlowTorch](https://github.com/stefanwebb/flowtorch). Some of these libraries may have interfaces that are not directly compatible with Pyro. See the [SVI with flow guide](svi_flow_guide.ipynb) and [VAE with flow prior](vae_flow_prior.ipynb) tutorials for example usages of [Zuko](https://github.com/probabilists/zuko) within Pyro.\n",
     "\n",
     "## Introduction\n",
     "\n",