chore: update link to arc

[sbrinkerhoff]

Why:

The Actions Runner Controller has moved into the actions org. This change updates the direct link.

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

See diff.

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• For content changes, I have completed the self-review checklist.

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
actions/hosting-your-own-runners/autoscaling-with-self-hosted-runners.md	fpt ghec ghes@ 3.7 3.6 3.5 3.4 3.3 ghae	fpt ghec ghes@ 3.7 3.6 3.5 3.4 3.3 ghae

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

@sbrinkerhoff Thanks for opening a PR! Great catch! ⚡

However, we did get a submission with this fix yesterday. Our repo is currently frozen until after the new year, so the update has not yet been made.

Since this is a duplicate, I'm going to go ahead and close this PR 💛

Thank you for your interest in improving GitHub Docs! 💖