Update storage-classes.md

Author: imuneeeb

content/en/docs/concepts/storage/storage-classes.md

@@ -290,16 +290,15 @@ parameters:
   type: io1
   iopsPerGB: "50"
   encrypted: "true"
-  tagSpecification_1: "key1=value1"
-  tagSpecification_2: "key2=hello world"
+  tagSpecification: "key1=value1"
 allowedTopologies:
 - matchLabelExpressions:
   - key: topology.ebs.csi.aws.com/zone
     values:
     - us-east-2c
 ```
 
-- `tagSpecification`: Tags to be applied on dynamically provisioned ebs volumes.
+- `tagSpecification`: Tags to be applied on dynamically provisioned ebs volumes through AWS_EBS_CSI_DRIVER (in v1.6.0 and later).
 
 ### NFS