Correctly visualize receiver fan-in/fan-out

[bripkens]

Why

Receivers accept data and forward it to one or more pipelines. Depending on the pipelines' implementation details however, it may be the case that the receivers have to copy the data:

https://github.com/open-telemetry/opentelemetry-collector/blob/b89b8194c1c00909e3fba173fed945b31e5be5a4/processor/memorylimiterprocessor/factory.go#L21

What

Visualize this fan-out and required data copying as it notably affects collector performance.