Improve autograd doc on complex numbers

[felixdivo]

A tiny change to fix formatting and clarify a bit in this section.

[pytorch-bot]

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BROKEN TRUNK - The following jobs failed but were present on the merge base 5e9fa0a:

• linux-bionic-cuda11.6-py3.10-gcc7 / test (default, 1, 4, linux.4xlarge.nvidia.gpu)
• linux-bionic-py3.7-clang9 / test (crossref, 1, 2, linux.2xlarge)
• linux-bionic-py3.7-clang9 / test (default, 1, 2, linux.2xlarge)
• linux-bionic-py3.7-clang9 / test (dynamo, 1, 2, linux.2xlarge)
• linux-focal-py3.7-gcc7 / test (default, 1, 2, linux.2xlarge)
• linux-focal-py3.9-clang7-asan / test (default, 3, 5, linux.2xlarge)
• win-vs2019-cpu-py3 / test (default, 1, 2, windows.4xlarge)

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[albanD]

Thanks!

[albanD]

@pytorchbot merge -f "Broken trunk"

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