Update expressroute-howto-add-ipv6.md

updated note to remove reference to Standard Public IP

Author: vishalme

articles/expressroute/expressroute-howto-add-ipv6.md

@@ -239,7 +239,7 @@ Follow these steps if you have an existing environment of Azure resources that y
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 > [!NOTE]
-> If you have an existing gateway that is not zone-redundant (meaning it is Standard, High Performance, or Ultra Performance SKU) and uses a public IP address of Basic SKU, you will need to delete and recreate the gateway using any SKU and a Standard, Static public IP address.
+> If you have an existing gateway that is not zone-redundant (meaning it is Standard, High Performance, or Ultra Performance SKU) and uses a public IP address of Basic SKU, you will need to delete and recreate the gateway using any SKU.
 
 ## Create a connection to a new virtual network