Update Set-AzEventHub.md (#13921)

Corrected input object variable in example 1.

Author: atul-ram

src/EventHub/EventHub/help/Set-AzEventHub.md

@@ -35,8 +35,8 @@ The Set-AzEventHub cmdlet updates the properties of the specified Event Hub.
 To update Eventhub with Capture description properties, please follow the below steps. 
 
 ```
-PS C:\> $CreatedEventHub = Get-AzEventHub -ResourceGroupName MyResourceGroupName -Namespace MyNamespaceName -Name MyEventHubName
-PS C:\> $createdEventHub.CaptureDescription = New-Object -TypeName Microsoft.Azure.Commands.EventHub.Models.PSCaptureDescriptionAttributes
+PS C:\> $createdEventHub = Get-AzEventHub -ResourceGroupName MyResourceGroupName -Namespace MyNamespaceName -Name MyCreatedEventHub
+PS C:\> $ceatedEventHub.CaptureDescription = New-Object -TypeName Microsoft.Azure.Commands.EventHub.Models.PSCaptureDescriptionAttributes
 PS C:\> $createdEventHub.CaptureDescription.Enabled = $true
 PS C:\> $createdEventHub.CaptureDescription.IntervalInSeconds  = 120
 PS C:\> $createdEventHub.CaptureDescription.Encoding  = "Avro"
@@ -45,10 +45,10 @@ PS C:\> $createdEventHub.CaptureDescription.Destination.Name = "EventHubArchive.
 PS C:\> $createdEventHub.CaptureDescription.Destination.BlobContainer = "container"
 PS C:\> $createdEventHub.CaptureDescription.Destination.ArchiveNameFormat = "{Namespace}/{EventHub}/{PartitionId}/{Year}/{Month}/{Day}/{Hour}/{Minute}/{Second}"
 PS C:\> $createdEventHub.CaptureDescription.Destination.StorageAccountResourceId = "/subscriptions/{SubscriptionId}/resourceGroups/MyResourceGroupName/providers/Microsoft.ClassicStorage/storageAccounts/arjunteststorage"
-PS C:\> Set-AzEventHub -ResourceGroupName MyResourceGroupName -Namespace MyNamespaceName -Name MyEventHubName -InputObject MyCreatedEventHub -messageRetentionInDays 4 -partitionCount 2
+PS C:\> Set-AzEventHub -ResourceGroupName MyResourceGroupName -Namespace MyNamespaceName -Name MyEventHubName -InputObject $createdEventHub 
 ```
 
-Updates the Event Hub \`MyEventHubName\` represented by the \`MyCreatedEventHub\` object, setting the message retention period to 4 days, the number of partitions to 2 and CaptureDescription properties
+Updates the Event Hub \`MyEventHubName\` represented by the \`MyCreatedEventHub\` object, setting the CaptureDescription properties
 
 ### Example 2
 ```