Rename "topic: not user facing"

[jackzhxng]

Stack from ghstack (oldest at bottom):

• Lower case #10790
• -> Rename "topic: not user facing" #10789

[pytorch-bot]

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[github-actions]

This PR needs a release notes: label

If your changes are user facing and intended to be a part of release notes, please use a label starting with release notes:.

If not, please add the release notes: N/A (exclude) label.

To add a label, you can comment to pytorchbot, for example
@pytorchbot label "release notes: N/A (exclude)"

For more information, see
https://github.com/pytorch/pytorch/wiki/PyTorch-AutoLabel-Bot#why-categorize-for-release-notes-and-how-does-it-work.