Fix the duplicated line in `advanced_source/privateuseone.rst`

[shink]

Description

Fix the duplicated line in advanced_source/privateuseone.rst

 1. Register new backend module to Pytorch.
-2. Generate methods and properties related to the new backend.
+2. Rename PrivateUse1 to a custom name for the new backend.
 3. Generate methods and properties related to the new backend.

Checklist

• [ ] The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• [ ] Only one issue is addressed in this pull request
• [ ] Labels from the issue that this PR is fixing are added to this pull request
• [ ] No unnecessary issues are included into this pull request.

cc @svekars @brycebortree @albanD

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2853

• :page_facing_up: Preview Python docs built from this PR

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[svekars]

The change looks good, can you please sign the CLA so we can merge? Thank you!

[shink]

@svekars Sorry for the late reply. I have signed the CLA, please take a look, thanks!