Docs: tensorboard profiler tutorial doesn't render properly

[ldorigo]

https://pytorch.org/tutorials/intermediate/tensorboard_profiler_tutorial.html , which should correspond to
https://github.com/pytorch/tutorials/blob/b6e9f3ad67f0a76f6cad9ac4e9bd4cc2db56947e/intermediate_source/tensorboard_profiler_tutorial.py , is not rendering properly - snippets of code are not visible.

[svekars]

@gaoteng-git can you please take a look?

[svekars]

Can replace :: with .. code-block:: to fix the issue.

[kiersten-stokes]

\assigntome

[kiersten-stokes]

/assigntome