Examples should use different string values

[npepinpe]

I recently helped a user through his use case with Kafka/Connect/Zeebe, and one of the hurdles he faced with the examples is we reuse the same strings everywhere, which for someone unaware might imply a connection between them. For example, the sink connector name is "pong", the message name is "pong", workflow name is "pong", etc. We should use different names to illustrate they have nothing related to each other (except in the places where they do!).