Add sample messages for existing documentation

[Relrin]

The following sections are required to append new sections/subsections:

• The reverse proxy documentaion has a lack of information about how the incoming message will be transformed into inner data format (with examples). This information will significally could help in debugging and writing tests for existing and/or new microservices.
• The matchmaking microservice documentation hasn't have an example of the message that comes from reverse proxy to this node.