Werk #16468: RabbitMQ: extend help text for instance name with macro option

Component	Setup
Title	RabbitMQ: extend help text for instance name with macro option
Date	Feb 12, 2024
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p26 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p43 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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