Update standard label docs

docs/chart_best_practices/labels.md

@@ -28,5 +28,5 @@ Name|Status|Description
 heritage | REC | This should always be set to `{{ .Release.Service }}`. It is for finding all things managed by Tiller.
 release | REC | This should be the `{{ .Release.Name }}`.
 chart | REC | This should be the chart name and version: `{{ .Chart.Name }}-{{ .Chart.Version \| replace "+" "_" }}`.
-app | OPT | This should be the app name, reflecting the entire app. Often the chart's `{{ .Chart.Name }}` is used for this. This is used by many Kubernetes manifests, and is not Helm-specific.
-component | OPT | This is a common label for marking the different roles that pieces may play in an application. For example, `component: frontend`
+app | REC | This should be the app name, reflecting the entire app. Usually `{{ template "name" . }}` is used for this. This is used by many Kubernetes manifests, and is not Helm-specific.
+component | OPT | This is a common label for marking the different roles that pieces may play in an application. For example, `component: frontend`.