update dt codelab (#290)

markdown/dt-otel/dt-otel.md

@@ -15,7 +15,7 @@ Duration: 0:03:00
 This codelab will take you through the basics of the Soalce PubSub+ Distributed Tracing feature. The following steps will take you through:
 * Launching and configuring a PubSub+ Event Broker locally via Docker
 * Launching and configuring the OpenTelemetry Collector Contribution
-* Launching Jaeger, the open source, end-to-end distributed tracing backend to observe our traces   
+* Launching Jaeger - the open source, end-to-end distributed tracing backend to observe our traces   
 * Publishing and receiving messages to/from your broker to generate broker trace events
 * Context propagation via auto-instrumented JMS applications that will generate end to end linked traces (publisher – broker – receiver traces)
 * Context propagation via manual-instrumented JCSMP applications that will generate end to end linked traces (publisher – broker – receiver traces)