replace commands/envcommand by DataSource in SecretGenerator

examples/combineConfigs.md

@@ -92,9 +92,9 @@ secret holding them (not covering that here).
 <!--
 secretGenerator:
 - name: app-tls
-  commands:
-    tls.crt: "cat tls.cert"
-    tls.key: "cat tls.key"
+  files:
+    tls.crt=tls.cert
+    tls.key=tls.key
   type: "kubernetes.io/tls"
 EOF
 -->

examples/generatorOptions.md

@@ -5,8 +5,6 @@ Kustomize provides options to modify the behavior of ConfigMap and Secret genera
  - disable appending a content hash suffix to the names of generated resources
  - adding labels to generated resources
  - adding annotations to generated resources
- - changing shell and arguments for getting data from commands
- - changing timeout for executing commands
  
 This demo shows how to use these options. First create a workspace.
 ```