Fix checkpoint doc small formatting issue

[soulitzer]

Stack from ghstack (oldest at bottom):

• -> Fix checkpoint doc small formatting issue #101419
• [BE] Make some simplifications to torch.utils.checkpoint logic #101193
• Disable Autograd when calling RecordFunction callbacks #100727
• torch.utils.checkpoint warns if user does not pass use_reentrant explicitly #100551
• Check inputs have same dtype in addmm_impl_cpu_ even if input has zero numel #100274

[pytorch-bot]

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[soulitzer]

Currently:

[albanD]

Thanks!

[soulitzer]

@pytorchbot merge

[pytorchmergebot]

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