docs: enhancement of the data plane signaling protocol doc #1801

Job	Run time
API-Tests	10m 54s
Component-Tests	13m 36s
Checkstyle	4m 44s
End-To-End-Tests	15m 49s
Javadoc	6m 28s
Postgresql-Integration-Tests	10m 29s
Unit-Tests	15m 17s
Upload-Coverage-Report-To-Codecov	11s
Upload-Test-Report	12s
	1h 17m 40s

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