Apply suggestions from code review

Author: qiancai

tidb-cloud/create-tidb-cluster-premium.md

@@ -35,7 +35,6 @@ If you do not have a TiDB Cloud account, click [here](https://tidbcloud.com/sign
 
 </CustomContent>
 
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 ## Steps
 
 If you are in the `Organization Owner` role, you can create a TiDB Cloud Premium instance as follows:
@@ -49,7 +48,6 @@ If you are in the `Organization Owner` role, you can create a TiDB Cloud Premium
 
 2. On the **TiDB Instances** page, click **Create Instance**.
 3. Enter a name for your TiDB Cloud Premium instance.
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 4. Choose a cloud provider and a region where you want to host your instance.
 5. Specify both a minimum and maximum number of Request Capacity Units (RCUs) for your instance