Corrected code block language

[willsawyerrrr]

Why:

Closes #23751

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

The code block was labelled as YAML, it is now correctly labelled as JSON.
Existing:

```yaml{:copy}

Proposed change:

```json{:copy}

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Content directory changes

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Source	Preview	Production	What Changed
actions/using-workflows/creating-starter-workflows-for-your-organization.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae

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

[cmwilson21]

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

[skedwards88]

Thanks for this fix! We'll get this merged down for you.

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