[WIP] Update privateuse1 doc

[shink]

Fixes https://github.com/pytorch/pytorch/issues/134293

cc @NmomoN @mengpenghui @fwenguang @cdzhan @1274085042 @PHLens @ailzhang @albanD

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3010

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