Update disks-performance-tiers-portal.md

Author: ramankumarlive

articles/virtual-machines/disks-performance-tiers-portal.md

@@ -39,27 +39,10 @@ The following steps show how to change the performance tier of your disk when yo
 
 You can also change your performance tier without downtime, so you don't have to deallocate your VM or detach your disk to change the tier.
 
-### Prerequisites
-
-You must enable the feature for your subscription before you can change the performance tier of a disk without downtime. Please follow the steps below to enable the feature for your subscription:
-
-1.	Execute the following command to register the feature for your subscription
-
-    ```azurecli
-    az feature register --namespace Microsoft.Compute --name LiveTierChange
-    ```
- 
-1.	Confirm that the registration state is **Registered** (may take a few minutes) using the following command before trying out the feature.
-
-    ```azurecli
-    az feature show --namespace Microsoft.Compute --name LiveTierChange
-    ```
-
 ### Change performance tier
 
 Now that the feature has been registered, you can change applicable disk's performance tiers without downtime.
 
-1. Sign in to the Azure portal from the following link: [https://aka.ms/diskPerfTiersPreview](https://aka.ms/diskPerfTiersPreview).
 1. Navigate to the VM containing the disk you'd like to change.
 1. Select your disk
 1. Select **Size + Performance**.