[chore] Clarify description of connectors (#7715)

See open-telemetry/opentelemetry.io#2725 (comment)

connector/README.md

@@ -1,7 +1,8 @@
 # Connectors
 
-A connector is both an exporter and receiver. It consumes data as an exporter in one pipeline
-and emits data as a receiver in another pipeline. It may consume and emit data of the same data
+A connector is both an exporter and receiver. As the name suggests a Connector connects
+two pipelines: it consumes data as an exporter at the end of one pipeline and emits data
+as a receiver at the start of another pipeline. It may consume and emit data of the same data
 type, or of different data types. A connector may generate and emit data to summarize the
 consumed data, or it may simply replicate or route data.