Duplicate description on customization

[ibrahiamm]

the description for customizing self-hosted runners was listed twice

Why:

Closes [issue link]

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Source	Staging	Production	What Changed
content/actions/hosting-your-own-runners/configuring-the-self-hosted-runner-application-as-a-service.md	Modified	Original

[ramyaparimi]

@ibrahiamm Thank you for opening the PR. I didn't notice the "customized self hosted description" listed twice in the docs. Could you please provide me with a link where you are seeing this description listed twice?

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