torch.jit doc link for nvfuser readme.md (pytorch#77780)

adding a quick link to nvfuser README.md in jit doc

Note that for 1.12 release, we probably want to have the link pointed to the doc in the release code base. I don't know if we have a tag for 1.12 release candidate yet, so we might want to update that.
Pull Request resolved: pytorch#77780
Approved by: https://github.com/davidberard98

Author: jjsjann123

docs/source/jit.rst

@@ -876,7 +876,7 @@ now supported.
 
 Fusion Backends
 ~~~~~~~~~~~~~~~
-There are a couple of fusion backends available to optimize TorchScript execution. The default fuser on CPUs is NNC, which can perform fusions for both CPUs and GPUs. The default fuser on GPUs is NVFuser, which supports a wider range of operators and has demonstrated generated kernels with improved throughput. See the  `NVFuser documentation <https://github.com/pytorch/pytorch/blob/release/1.12/torch/csrc/jit/codegen/cuda/README.md>`_ for more details on usage and debugging.
+There are a couple of fusion backends available to optimize TorchScript execution. The default fuser on CPUs is NNC, which can perform fusions for both CPUs and GPUs. The default fuser on GPUs is NVFuser, which supports a wider range of operators and has demonstrated generated kernels with improved throughput. See the  `NVFuser documentation <https://github.com/pytorch/pytorch/blob/master/torch/csrc/jit/codegen/cuda/README.md>`_ for more details on usage and debugging.
 
 
 References