Update 05_automatic_idling.md

[raulmarinperez]

idle parts doesn't make sense, it should be active parts

Summary

I saw a response to a customer including this text and that caught my attention as I never heard of "idle parts"... as far as I know a part can be active or inactive and, within this context, it's clear that it's referring to an active part

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[mintlify]

Docs PR opened: ClickHouse/mintlify-docs-dev#318

Corrected "maximum idle parts threshold" to "maximum active parts threshold" in the automatic idling adaptive conditions list.