(AzureCXP) fixes MicrosoftDocs/azure-docs#104129

From
docker tag mcr.microsoft.com/azuredocs/azure-vote-front:v1 /azure-vote-front:v2
To
docker tag /azure-vote-front:v1 /azure-vote-front:v2

Author: AjayBathini-MSFT

articles/aks/tutorial-kubernetes-app-update.md

@@ -98,7 +98,7 @@ To correctly use the updated image, tag the *azure-vote-front* image with the lo
 Use [docker tag][docker-tag] to tag the image. Replace `<acrLoginServer>` with your ACR login server name or public registry hostname, and update the image version to *:v2* as follows:
 
 ```console
-docker tag mcr.microsoft.com/azuredocs/azure-vote-front:v1 <acrLoginServer>/azure-vote-front:v2
+docker tag /azure-vote-front:v1 /azure-vote-front:v2
 ```
 
 Now use [docker push][docker-push] to upload the image to your registry. Replace `<acrLoginServer>` with your ACR login server name.