fix(docs): torch.autograd.graph.Node.register_hook can override grad_inputs, not grad_outputs (pytorch#100272)

Fixes pytorch#99165

Pull Request resolved: pytorch#100272
Approved by: https://github.com/soulitzer

Author: olokshyn

torch/autograd/graph.py

@@ -58,7 +58,7 @@ def register_hook(self, fn: Callable[..., Any]) -> RemovableHandle:
 
 
         The hook should not modify its argument, but it can optionally return
-        a new gradient which will be used in place of :attr:`grad_outputs`.
+        a new gradient which will be used in place of :attr:`grad_inputs`.
 
         This function returns a handle with a method ``handle.remove()``
         that removes the hook from the module.