Update 04-Icinga-Config.md

[koelle25]

I think it should be Use-Icinga (instead of just icinga, which starts the IMC), as it is also the case for 01-Director-Baskets.md and 02-Manual-Integration.md.

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[koelle25]

Hey @cla-bot, I've just signed the CLA 👍

[bobapple]

@cla-bot check

[LordHepipud]

Thanks!