Update Spring Boot example config for Dynatrace

Author: arminru

samples/micrometer-samples-boot2/src/main/resources/application-dynatrace.yml

@@ -16,6 +16,9 @@
 
 management.metrics.export.dynatrace:
   enabled: true
-  apiToken: my-api-token
-  uri: https://my-environment-id.live.dynatrace.com
-  deviceId: my-custom-device
+  api-version: v2
+
+  # If you are not using the OneAgent on your host, additionally specify your Dynatrace environment and API token:
+  uri: "https://{your-environment-id}.live.dynatrace.com/api/v2/metrics/ingest"
+  # uri: "https://{your-domain}/e/{your-environment-id}/api/v2/metrics/ingest" for managed deployments
+  api-token: "YOUR_TOKEN" # should be read from a secure property source