docs: document mTLS configuration for NiFi 2.x monitoring #2444

Job	Run time
Run Cargo Udeps	1m 53s
Decide if Helm charts are pushed to the helm repository based on action trigger	2s
Check if committed README is the one we would render from the available parts	31s
Run Clippy	44s
Run Cargo Deny (bans licenses sources)	48s
Run Cargo Deny (advisories)	43s
Check if committed Helm charts are up to date	45s
Run Rustfmt	12s
Run RustDoc	1m 23s
Run Cargo Tests	44s
All tests passed	3s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 44s
Package Charts, Build Docker Image and publish them - ubuntu-latest	12m 7s
Build and publish manifest list	46s
Run the OpenShift Preflight check on the published images	19s
	30m 44s

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