trunk/891b6e7465098a23e2e65937b18aae67f6746a5f: [Docs] Document actual keyword argument names for tensor_split (#182075)

Fixes #126949

torch.tensor_split documents its second parameter as indices_or_sections (matching NumPy), but the underlying overloaded functions use different keyword argument names:

torch.tensor_split(x, indices_or_sections=3)  # TypeError
torch.tensor_split(x, sections=3)             # works
torch.tensor_split(x, indices=(1, 6))         # works

This adds a note to the docstring documenting the actual keyword argument names (sections for int, indices for list/tuple) so users can use them correctly.

Pull Request resolved: #182075
Approved by: https://github.com/zou3519