Update documentation for sidekiq memory killer
What does this MR do and why?
We replaced our old Daemon Sidekiq Memory Killer with new Watchdog Memory Killer that is also used for Puma. The watchdog is backward compatible with the old Daemon Sidekiq Memory Killer and it's configuration, so the self-managed customers will see no difference.
This MR updates documentation for configuring Sidekiq Memory killer. We think that Watchdog/Memory Killer is just internal implementation detail, and this MR focuses in updating documentation how to configure/tweak and monitor this in order to reduce memory use.
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Related to #389821 (closed)