[ROCm] Update C++ Custom Operators tutorial with note about AMD GPU. (#3198)

* Update C++ Custom Operators tutorial with note about AMD GPU.

* Put in a NOTE call out box and change to AMD ROCm.

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Co-authored-by: Svetlana Karslioglu <[email protected]>

Author: naromero77amd

advanced_source/cpp_custom_ops.rst

@@ -19,6 +19,10 @@ Custom C++ and CUDA Operators
        * PyTorch 2.4 or later
        * Basic understanding of C++ and CUDA programming
 
+.. note::
+
+  This tutorial will also work on AMD ROCm with no additional modifications.
+
 PyTorch offers a large library of operators that work on Tensors (e.g. torch.add, torch.sum, etc).
 However, you may wish to bring a new custom operator to PyTorch. This tutorial demonstrates the
 blessed path to authoring a custom operator written in C++/CUDA.