Fix curl formatting in doc/api/admin_sidekiq_queues.md

What does this MR do and why?

Indents the continuation lines of the curl example in doc/api/admin_sidekiq_queues.md, so it follows the REST API style guide.

The example already used one parameter per line, a trailing \ and an explicit --url. The --header and --url lines were missing their two-space indent.

Related to #509818

References

MR acceptance checklist

Evaluated against the MR acceptance checklist. Docs-only change.

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