Use correct description of detaching a fork

[ocdtrekkie]

Why:

When I was looking at detaching a fork, I read these docs and when I came across the word "delete" here, I was concerned this might delete my fork instead of detaching it. I believe this part of the documentation was copied from the details about how to delete a repo (or manually detach, which includes deleting the repo), and changing this word was missed.

What's being changed (if available, include any code snippets, screenshots, or gifs):

In the section about automatically detaching a fork, I just changed "deleting" to "detaching", since the process described in this section does NOT delete the fork.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Source	Review	Production	What Changed
pull-requests/collaborating-with-pull-requests/working-with-forks/detaching-a-fork.md	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

Thanks so much for opening a PR! I'll get this triaged for review

[jesesjr]

  "runner_name": "my runner",

[changeschung]

  "runner_name": "my runner",

Can you help this runner_name?