Update csi-migrate-in-tree-volumes.md

Author: andyzhangx

articles/aks/csi-migrate-in-tree-volumes.md

@@ -110,7 +110,7 @@ The following are important considerations to evaluate:
         i=$((i + 1))
       else
         PVC_CREATION_TIME=$(kubectl get pvc  $PVC -n $NAMESPACE -o jsonpath='{.metadata.creationTimestamp}')
-        if [[ $PVC_CREATION_TIME > $STARTTIMESTAMP ]]; then
+        if [[ $PVC_CREATION_TIME >= $STARTTIMESTAMP ]]; then
           if [[ $ENDTIMESTAMP > $PVC_CREATION_TIME ]]; then
             PV="$(kubectl get pvc $PVC -n $NAMESPACE -o jsonpath='{.spec.volumeName}')"
             RECLAIM_POLICY="$(kubectl get pv $PV -n $NAMESPACE -o jsonpath='{.spec.persistentVolumeReclaimPolicy}')"
@@ -183,7 +183,7 @@ The following are important considerations to evaluate:
    * `namespace` - The cluster namespace
    * `sourceStorageClass` - The in-tree storage driver-based StorageClass
    * `targetCSIStorageClass` - The CSI storage driver-based StorageClass, which can be either one of the default storage classes that have the provisioner set to **disk.csi.azure.com** or **file.csi.azure.com**. Or you can create a custom storage class as long as it is set to either one of those two provisioners. 
-   * `startTimeStamp` - Provide a start time in the format **yyyy-mm-ddthh:mm:ssz**.
+   * `startTimeStamp` - Provide a start time **before** PVC creation time in the format **yyyy-mm-ddthh:mm:ssz**
    * `endTimeStamp` - Provide an end time in the format **yyyy-mm-ddthh:mm:ssz**.
 
     ```bash