[AUTO-BACKPORT 10178] docs: known issue of tb_plugin (#10181)

Co-authored-by: Jerry G <[email protected]>

docs/release-notes/pytorch-tensorboard-plugin.rst

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+:orphan:
+
+**Known Issue**
+
+-  PyTorch has `deprecated
+   <https://pytorch.org/tutorials/intermediate/tensorboard_profiler_tutorial.html#use-tensorboard-to-view-results-and-analyze-model-performance>`
+   their Profiler TensorBoard Plugin (``tb_plugin``), so some features may not be compatible with
+   PyTorch 2.0 and above. Our current default environment image comes with PyTorch 2.3. If users
+   experiencing issues with this plugin, we suggest using an image with PyTorch version earilier
+   than 2.0.