Update getting-started.md (open-telemetry#3621)

Author: r0ck37

content/en/docs/collector/getting-started.md

@@ -50,7 +50,7 @@ To follow this tutorial you need the following
    telemetrygen traces --otlp-insecure --duration 5s
    ```
 
-   After five seconds, `telemetrygen` stops and shows the sended messages in the
+   After five seconds, `telemetrygen` stops and shows the sent messages in the
    console:
 
    ```text