[docs] fix incorrect example in convert_conv3d_weight_memory_format

[a-r-r-o-w]

The current example fails when using torch.channels_last, and the docs are slightly incorrect for the 3d case.

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 2f7df31 with merge base c7113a6 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• trunk / win-vs2019-cpu-py3 / test (default, 1, 3, windows.4xlarge.nonephemeral) (gh) (similar failure)
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[albanD]

Thanks!
Could you rebase on latest main?

[a-r-r-o-w]

Thanks for the review @albanD, done!

[albanD]

@pytorchbot merge

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