Update service defaults docs to include details of changes in 9.2 to filter request traces for the health endpoints

[DamianEdwards]

9.2 made a change to the starter template to add a call to WithHttpHealthCheck("/health") for the ASP.NET Core projects added. In order to avoid requests to that endpoint from the app host during development from spamming the request trace logs in the dashboard, the service defaults templates were updated to filter out request traces for the configured health endpoints (/health and /alive). We should ensure the appropriate documentation is updated to reflect this change if appropriate.