Add doc for TBPTT (#20422)
* Add doc for TBPTT
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* remove url to prevent linting error
* attempt to fix linter
* add tbptt.rst file
* adjust doc:
* nit
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* make example easily copy and runnable
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* address comments
* fix doc test warning
* Update docs/source-pytorch/common/tbptt.rst
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Co-authored-by: Alan Chu <alanchu@Alans-Air.lan>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Luca Antiga <luca.antiga@gmail.com>
Co-authored-by: Alan Chu <alanchu@Alans-Air.Home>
Co-authored-by: Luca Antiga <luca@lightning.ai>
