docs: fix dangling sentence fragment in PrivateUse1

[abhiman123]

Fixes #3849

Description

In the file PrivateUse1, there existed a dangling sentence fragment that appeared to be forgotten:

you are an advanced user of PyTorch.

This PR removes that.

Checklist

• The issue that is being fixed is referred to 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 in this pull request.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3898

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As of commit 1955c56 with merge base 36f3ca7 ():
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[svekars]

Please remove all the unnecessary files.