Merge pull request kubernetes#91194 from wawa0210/update-envvarsource-doc

Update env varsource api documentation

Author: k8s-ci-robot

api/openapi-spec/swagger.json

@@ -1774,7 +1774,7 @@ type EnvVar struct {
 // EnvVarSource represents a source for the value of an EnvVar.
 // Only one of its fields may be set.
 type EnvVarSource struct {
-	// Selects a field of the pod: supports metadata.name, metadata.namespace, metadata.labels, metadata.annotations,
+	// Selects a field of the pod: supports metadata.name, metadata.namespace, `metadata.labels['<KEY>']`, `metadata.annotations['<KEY>']`,
 	// metadata.uid, spec.nodeName, spec.serviceAccountName, status.hostIP, status.podIP, status.podIPs.
 	// +optional
 	FieldRef *ObjectFieldSelector

pkg/apis/core/types.go

@@ -1857,7 +1857,7 @@ type EnvVar struct {
 
 // EnvVarSource represents a source for the value of an EnvVar.
 type EnvVarSource struct {
-	// Selects a field of the pod: supports metadata.name, metadata.namespace, metadata.labels, metadata.annotations,
+	// Selects a field of the pod: supports metadata.name, metadata.namespace, `metadata.labels['<KEY>']`, `metadata.annotations['<KEY>']`,
 	// spec.nodeName, spec.serviceAccountName, status.hostIP, status.podIP, status.podIPs.
 	// +optional
 	FieldRef *ObjectFieldSelector `json:"fieldRef,omitempty" protobuf:"bytes,1,opt,name=fieldRef"`