Documentation update torch.clone #156644 (#157007)

updated torch clone docs to reflect implemented memory behavior

Fixes #156644

Pull Request resolved: https://github.com/pytorch/pytorch/pull/157007
Approved by: https://github.com/malfet, https://github.com/svekars

Co-authored-by: Svetlana Karslioglu <svekars@meta.com>

torch/_torch_docs.py

@@ -2782,6 +2782,12 @@ Returns a copy of :attr:`input`.
     result of this operation to :attr:`input`. To create a tensor without an
     autograd relationship to :attr:`input` see :meth:`~Tensor.detach`.
 
+    In addition, when ``torch.preserve_format`` is used:
+    If the input tensor is dense (i.e., non-overlapping strided),
+    its memory format (including strides) is retained.
+    Otherwise (e.g., a non-dense view like a stepped slice),
+    the output is converted to the dense (contiguous) format.
+
 Args:
     {input}