Fix AIO webhook worker command

[lntutor]

☑️ Resolves

• Fix Small typo for AIO webhook polling script #15399

🖼️ Screenshots

Not applicable; this corrects a command example without changing visual documentation.

✅ Checklist

• I have built the documentation locally and reviewed the output
• Screenshots are included for visual changes (not applicable)
• I have not moved or renamed pages
• I have run codespell and addressed any spelling issues

Validation: sphinx-lint, codespell, and the warning-as-error Administration Manual HTML build all pass.

[lntutor]

Current head 1c27933602c85caff944745934355662143a0719 is mergeable, DCO is green on this head, and there are no unresolved review threads on the current PR state. This looks ready for maintainer review when convenient.

[github-actions]

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