[Doc] Add `Tensor.Shape` (#104750)
Summary:
Add `Tensor.Shape` doc.
Fix: #104038
Ref:
- https://github.com/pytorch/pytorch/issues/5544
- https://github.com/pytorch/pytorch/issues/1980
Differential Revision: D47278630
CC: @svekars @carljparker
Pull Request resolved: https://github.com/pytorch/pytorch/pull/104750
Approved by: https://github.com/mikaylagawarecki