Clarify Ingress monitoring instruction docs

doc/user/project/integrations/prometheus_library/nginx_ingress.md

@@ -38,6 +38,8 @@ Managing these settings depends on how NGINX Ingress has been deployed. If you h
 
 ## Specifying the Environment label
 
-In order to isolate and only display relevant metrics for a given environment, GitLab needs a method to detect which labels are associated. To do this, GitLab searches for metrics with appropriate labels. In this case, the `ingress` label must `<CI_ENVIRONMENT_SLUG>`.
+To isolate and display only relevant metrics for a given environment, GitLab needs a method to
+detect which labels are associated. To do this, GitLab searches for metrics with appropriate labels.
+In this case, the `ingress` label must include the value `<CI_ENVIRONMENT_SLUG>`.
 
 If you have used [Auto Deploy](../../../../topics/autodevops/stages.md#auto-deploy) to deploy your app, this format is used automatically and metrics are detected with no action on your part.