Fix torch.bucketize docs for "right"

The docs correctly (i.e matching actual op behavior) state that

`right = False` means `boundaries[i-1] < input[m][n]...[l][x] <= boundaries[i]`.

However they previously stated that
`If 'right' is False (default), then the left boundary is closed.`

which contradicts the `boundaries[i-1] < input[m][n]...[l][x] <= boundaries[i]` statement.

This modifies the docs to say `... then the left boundary is OPEN.` and also clarifies that this is the opposite behavior of numpy.digitize.

ghstack-source-id: 641dc9124bc6075dfe15faaf70ff29a5e843e612
Pull Request resolved: #104474

torch/_torch_docs.py

@@ -13787,8 +13787,10 @@ def merge_dicts(*dicts):
 
 Returns the indices of the buckets to which each value in the :attr:`input` belongs, where the
 boundaries of the buckets are set by :attr:`boundaries`. Return a new tensor with the same size
-as :attr:`input`. If :attr:`right` is False (default), then the left boundary is closed. More
-formally, the returned index satisfies the following rules:
+as :attr:`input`. If :attr:`right` is False (default), then the left boundary is open. Note that
+this behavior is opposite the behavior of
+`numpy.digitize <https://docs.scipy.org/doc/numpy/reference/generated/numpy.digitize.html>`_
+More formally, the returned index satisfies the following rules:
 
 .. list-table::
    :widths: 15 85