docs: Update incorrect port in Docker Compose the go-prometheus-monitoring guide (#22614)

<!--Delete sections as needed -->

## Description

The app service port is `8000`, and I mistakenly mentioned `8080` for
health check while creating this guide. So, it will give an error.

- [ ] Technical review
- [x] Editorial review
- [ ] Product review

Author: Pradumnasaraf

content/guides/go-prometheus-monitoring/compose.md

@@ -27,7 +27,7 @@ services:
     networks:
       - go-network
     healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
       interval: 30s
       timeout: 10s
       retries: 5
@@ -163,4 +163,4 @@ Next, you will learn how to develop the Golang application with Docker Compose a
 
 ## Next steps
 
-In the next section, you will learn how to develop the Golang application with Docker. You will also learn how to use Docker Compose Watch to rebuild the image whenever you make changes to the code. Lastly, you will test the application and visualize the metrics in Grafana using Prometheus as the data source.
+In the next section, you will learn how to develop the Golang application with Docker. You will also learn how to use Docker Compose Watch to rebuild the image whenever you make changes to the code. Lastly, you will test the application and visualize the metrics in Grafana using Prometheus as the data source.