Fix duplicate list entry name in about-self-hosted-runners.md

[wil93]

Why:

This list entry has a duplicate name:

What's being changed:

Removed the duplication in a similar way to how it's done in other entries of the same list.

Check off the following:

• All of the tests are passing.
• I have reviewed my changes in staging.
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[welcome]

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[janiceilene]

Thanks so much for opening a PR @wil93! I'll get this triaged for review ⚡

[lucascosti]

Hi @wil93! Thanks for this change. 🙇‍♂️

You are right in that there is duplication here, but the {% data reusables.github-actions.usage-matrix-limits %} reusable is used in a few other places in the docs:

For example:

• https://github.com/wil93/docs/blame/patch-1/content/actions/reference/usage-limits-billing-and-administration.md#L45
• https://github.com/wil93/docs/blame/patch-1/content/actions/reference/workflow-syntax-for-github-actions.md#L764

Because it is used in the Workflow Syntax article without being a list, the best fix for this issue is to remove the - **Job matrix** - from the reusable file itself:

https://github.com/github/docs/blame/main/data/reusables/github-actions/usage-matrix-limits.md#L1

[lucascosti]

Thanks heaps for the fix, @wil93! I'll get this merged in 🚀

[github-actions]

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