[chore][exporter/datadogexporter] Update traces endpoint in example (#…

…31262)

exporter/datadogexporter/examples/collector.yaml

@@ -301,7 +301,7 @@ exporters:
  ## The host of the Datadog intake server to send traces to.
  ## If unset, the value is obtained through the `site` parameter in the `api` section.
  #
- # endpoint: https://api.datadoghq.com
+ # endpoint: https://trace.agent.datadoghq.com
 
  ## @param ignore_resources - list of strings - optional
  ## A blocklist of regular expressions can be provided to disable certain traces based on their resource name