Fix: update export2config and export2secret example (#4940)

Signed-off-by: Jianbo Sun <jianbo.sjb@alibaba-inc.com>
(cherry picked from commit b2de4020a4)

Co-authored-by: Jianbo Sun <jianbo.sjb@alibaba-inc.com>

references/docgen/def-doc/workflowstep/export2config.eg.md

@@ -2,31 +2,33 @@
 apiVersion: core.oam.dev/v1beta1
 kind: Application
 metadata:
-  name: export-config
+  name: export2config
   namespace: default
 spec:
   components:
-  - name: express-server
-    type: webservice
-    properties:
-      image: oamdev/hello-world
-      port: 8000
+    - name: export2config-demo-server
+      type: webservice
+      properties:
+        image: oamdev/hello-world
+        port: 8000
   workflow:
     steps:
       - name: apply-server
         type: apply-component
-        outputs: 
+        outputs:
           - name: status
             valueFrom: output.status.conditions[0].message
         properties:
-          component: express-server
+          component: export2config-demo-server
       - name: export-config
-        type: export-config
+        type: export2config
         inputs:
           - from: status
             parameterKey: data.serverstatus
         properties:
           configName: my-configmap
           data:
-            testkey: testvalue
+            testkey: |
+              testvalue
+              value-line-2
 ```

references/docgen/def-doc/workflowstep/export2secret.eg.md

@@ -6,7 +6,7 @@ metadata:
   namespace: default
 spec:
   components:
-  - name: express-server
+  - name: express-server-sec
     type: webservice
     properties:
       image: oamdev/hello-world
@@ -19,14 +19,16 @@ spec:
           - name: status
             valueFrom: output.status.conditions[0].message
         properties:
-          component: express-server
+          component: express-server-sec
       - name: export-secret
-        type: export-secret
+        type: export2secret
         inputs:
           - from: status
             parameterKey: data.serverstatus
         properties:
           secretName: my-secret
           data:
-            testkey: testvalue
+            testkey: |
+              testvalue
+              value-line-2
 ```