Use the same name in volumeMounts and volumes

In some example files of vSphere volumes, volumeMounts and volumes
have different names. kubectl create will fail with error message
saying the pod is invalid because volumeMount with the name is not
found.

volumes/vsphere/README.md

@@ -176,7 +176,7 @@
           - name: test-volume
             mountPath: /test-vmdk
         volumes:
-        - name: vmdk-storage
+        - name: test-volume
           persistentVolumeClaim:
             claimName: pvc0001
       ```
@@ -315,7 +315,7 @@
           - name: test-volume
             mountPath: /test-vmdk
         volumes:
-        - name: vmdk-storage
+        - name: test-volume
           persistentVolumeClaim:
             claimName: pvcsc001
       ```

volumes/vsphere/vsphere-volume-pvcpod.yaml

@@ -10,6 +10,6 @@ spec:
     - name: test-volume
       mountPath: /test-vmdk
   volumes:
-  - name: vmdk-storage
+  - name: test-volume
     persistentVolumeClaim:
       claimName: pvc0001

volumes/vsphere/vsphere-volume-pvcscpod.yaml

@@ -10,6 +10,6 @@ spec:
     - name: test-volume
       mountPath: /test-vmdk
   volumes:
-  - name: vmdk-storage
+  - name: test-volume
     persistentVolumeClaim:
       claimName: pvcsc0001