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Docs: differentiate sidekiq max_/concurrency

What does this MR do?

Performing Operations in GitLab > Extra Sidekiq processes#limiting-concurrency

The sidekiq-cluster configuration setting sidekiq_cluster['max_concurrency'] was incorrectly documented as only sidekiq['concurrency'], which sets a different runtime configuration. This MR clarifies that.

sidekiq-cluster max_concurrency option is used to calculate a concurrency for each sidekiq process started by sidekiq-cluster.

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