Remove the release note which should be reverted.

This release note should be reverted in the PR: Azure/azure-powershell#13250. But be added back in another PR.

Author: wyunchi-ms

docs-conceptual/azps-5.0.0/release-notes-azureps.md

@@ -135,7 +135,6 @@ ms.service: azure-powershell
 * Removed '-ApiVersion' parameter from '*-AzDeployment' cmdlets.
 
 #### Az.Sql
-* Added DiffBackupIntervalInHours to 'Set-AzSqlDatabaseBackupShortTermRetentionPolicy' 
 * Fixed issue where New-AzSqlDatabaseExport fails if networkIsolation not specified [#13097]
 * Fixed issue where New-AzSqlDatabaseExport and New-AzSqlDatabaseImport were not returning OperationStatusLink in the result object [#13097]
 * Update Azure Paired Regions URL in Backup Storage Redundancy Warnings