Fix torch.bucketize docs for "right" (#104474)
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.
Fixes #91580
Pull Request resolved: https://github.com/pytorch/pytorch/pull/104474
Approved by: https://github.com/aakhundov, https://github.com/svekars
