fix comments

Author: etheleon

manifests/kustomize/base/cache-deployer/kustomization.yaml

@@ -11,3 +11,4 @@ labels:
   - includeSelectors: true
     pairs:
       app: cache-deployer
+      application-crd-id: kubeflow-pipelines

manifests/kustomize/base/postgresql/cache/cache-deployment-patch.yaml

@@ -2,7 +2,7 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: cache-server
-  label:
+  labels:
     application-crd-id: kubeflow-pipelines
 spec:
   selector:

manifests/kustomize/base/postgresql/pipeline/ml-pipeline-apiserver-deployment-patch.yaml

@@ -2,15 +2,15 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: ml-pipeline
-  label:
+  labels:
     application-crd-id: kubeflow-pipelines
 spec:
   selector:
     matchLabels:
       application-crd-id: kubeflow-pipelines
   template:
     metadata:
-      label:
+      labels:
         application-crd-id: kubeflow-pipelines
     spec:
       containers: