This link in `extend_dispatcher.rst` is outdated and cannot be accessed.

[Ericsii]

When I tried to access this link in the tutorial, I got a 404 error.

tutorials/advanced_source/extend_dispatcher.rst

Line 70 in 89b3343

One example in pytorch repo is `Vulkan TensorImpl <https://github.com/pytorch/pytorch/blob/1.7/aten/src/ATen/native/vulkan/VulkanOpaqueTensorImpl.h>`_.

cc @svekars @brycebortree